# My daughter's alphabet

The other day we were writing sentences with my daughter with a fridge magnet letter. While we were able to make some(I love cat), we didn't have enough letters to make the others (I love you too) due to an insufficient amount of letters o (4)

I then found out that while one set included 3 e letters it had only 2 o letters. Probably inspired by http://en.wikipedia.org/wiki/Letter_frequency this would still not reflect the actual situation "on the fridge".

## Problem

Given the text file where each line contains a "sample sentence" one would want to write on the fridge, propose an alphabet set with minimum amount of letters but still sufficient to write each sentence individually.

Note: ignore cases, all magnet letters are capitals anyway.

## Input

The file contain newline separated sentences:

hello
i love cat
i love dog
i love mommy


## Output

Provide back sorted list of letters, where each letter appears only as many times to be sufficient to write any sentence:

acdddeghillmmmoostvyy


(thanks, isaacg!)

## Winner

Shortest implementation (code)

### UPDATED: Testing

I have created an extra test and tried with various answers here:

https://gist.github.com/romaninsh/11159751

• There should be a letter v in the output ;) – Antonio Ragagnin Apr 10 '14 at 6:35
• Are we allowed / required to substitute an upside-down M for a W, or a sideways N for a Z? ;-) – Ilmari Karonen Apr 10 '14 at 11:42
• Basically you can construct any letter using Is. – swish Apr 10 '14 at 11:53
• More seriously, when you say "ignore cases", do you mean that we can assume that the input is already all in the same case, or that we must convert it all into the same case? Also, is it OK for the output to include some leading spaces? – Ilmari Karonen Apr 10 '14 at 12:01
• @Doorknob: _\¯ – Ilmari Karonen Apr 10 '14 at 13:37

# GolfScript, 28 / 34 chars

n/:a{|}*{a{.[2$]--}%*$-1=}%$ The 28-character program above assumes that all the input letters are in the same case. If this is not necessarily so, we can force them into upper case by prepending {95&}% to the code, for a total of 34 chars: {95&}%n/:a{|}*{a{.[2$]--}%*$-1=}%$


Notes:

• For correct operation, the input must include at least one newline. This will be true for normal text files with newlines at the end of each line, but might not be true if the input consists of just one line with no trailing newline. This could be fixed at the cost of two extra chars, by prepending n+ to the code.

• The uppercasing used in the 34-character version is really crude — it maps lowercase ASCII letters to their uppercase equivalents (and spaces to NULs), but makes a complete mess of numbers and most punctuation. I'm assuming that the input will not include any such characters.

• The 28-character version treats all input characters (except newlines and NULs) equally. In particular, if the input contains any spaces, some will also appear in the output; conveniently, they will sort before any other printable ASCII characters. The 34-character version, however, does ignore spaces (because it turns out I can do that without it costing me any extra chars).

Explanation:

• The optional {95&}% prefix uppercases the input by zeroing out the sixth bit of the ASCII code of each input byte (95 = 64 + 31 = 10111112). This maps lowercase ASCII letters to uppercase, spaces to null bytes, and leaves newlines unchanged.

• n/ splits the input at newlines, and :a assigns the resulting array into the variable a. Then {|}* computes the set union of the strings in the array, which (assuming that the array has at least two elements) yields a string containing all the unique (non-newline) characters in the input.

• The following { }% loop then iterates over each of these unique characters. Inside the loop body, the inner loop a{.[2$]--}% iterates over the strings in the array a, removing from each string all characters not equal to the one the outer loop is iterating over. The inner loop leaves the ASCII code of the current character on the stack, below the filtered array. We make use of this by repeating the filtered array as many times as indicated by the ASCII code (*) before sorting it ($) and taking the last element (-1=). In effect, this yields the longest string in the filtered array (as they all consist of repeats of the same character, lexicographic sorting just sorts them by length), except if the character has ASCII code zero, in which case it yields nothing.

• Finally, the $ at the end just sorts the output alphabetically. • Amazing. TODO: Learn GolfScript! – DLosc Apr 13 '14 at 2:38 • You may even reduce it to 26: n/:a{|}*{{{=}+,}+a%$-1=}%$. – Howard Jun 5 '14 at 9:41 # J - 37 char Reads from stdin, outputs to console. dlb#&a.>./+/"2=/&a.tolower;._2[1!:1]3  1!:1]3 is the call to stdin. tolower;._2 performs double duty by splitting up the lines and making them lowercase simultaneously. Then we count how many times a character occurs in each row with +/"2=/&a., and take the pointwise maximum over all lines with >./. Finally, we pull that many of each character out of the alphabet with #&a.. This includes spaces—all found at the front due to their low ASCII value—so we just delete leading blanks with dlb. # JavaScript (ECMAScript 6) - 148139 135 Characters Version 2: Updated to use array comprehension: [a[i]for(i in a=[].concat(...s.split('\n').map(x=>x.split(/ */).sort().map((x,i,a)=>x+(a[i-1]==x?++j:j=0)))).sort())if(a[i-1]<a[i])]  Version 1: [].concat(...s.split('\n').map(x=>x.split(/ */).sort().map((x,i,a)=>x+(a[i-1]==x?++j:j=0)))).sort().filter((x,i,a)=>a[i-1]!=x).map(x=>x)  Assumes that: • The input string is in the variable s; • We can ignore the case of the input (as specified by the question - i.e. it is all in either upper or lower case); • The output is an array of characters (which is about as close as JavaScript can get to the OP's requirement of a list of characters); and • The output is to be displayed on the console. With comments: var l = s.split('\n') // split the input up into sentences .map(x=>x.split(/ */) // split each sentence up into letters ignoring any // whitespace .sort() // sort the letters in each sentence alphabetically .map((x,i,a)=>x+(a[i-1]==x?++j:j=0))) // append the frequency of previously occurring identical // letters in the same sentence to each letter. // I.e. "HELLO WORLD" => // ["D0","E0","H0","L0","L1","L2","O0","O1","R0","W0"] [].concat(...l) // Flatten the array of arrays of letters+frequencies // into a single array. .sort() // Sort all the letters and appended frequencies // alphabetically. .filter((x,i,a)=>a[i-1]!=x) // Remove duplicates and return the sorted .map(x=>x) // Get the first letter of each entry (removing the // frequencies) and return the array.  If you want to: • Return it as a string then add .join('') on the end; • Take input from a user then replace the s variable with prompt(); or • Write it as a function f then add f=s=> to the beginning. Running: s="HELLO\nI LOVE CAT\nI LOVE DOG\nI LOVE MOMMY\nMOMMY LOVE DADDY"; [].concat(...s.split('\n').map(x=>x.split(/ */).sort().map((x,i,a)=>x+(a[i-1]==x?++j:j=0)))).sort().filter((x,i,a)=>a[i-1]!=x).map(x=>x)  Gives the output: ["A","C","D","D","D","E","G","H","I","L","L","M","M","M","O","O","T","V","Y","Y"]  • Nice! You can save 3 bytes by reducing /\s*/ to / */ and removing the parens around j=0 – nderscore Apr 11 '14 at 6:16 • couldn't you use ... instead of apply ? – Ven Apr 12 '14 at 21:57 • Thanks to you both - that saves 9 characters - The spread (...) operator is one I've not come across before. – MT0 Apr 12 '14 at 22:30 • [].concat(...s.splitN.map(x=>x.split(/ */).map((x,i,a)=>x+(a[x]=a[x]?++j:j=1)))).sort().map((x,i,a)=>a[i-1]<x?x:'').join; – l4m2 May 12 '18 at 5:35 ## Perl - 46 bytes #!perl -p$s=~s/$_//ifor/./g;$s.=uc}for(sort$s=~/\w/g){  Counting the shebang as 1. This is a loose translation of the Ruby solution below. ## Ruby 1.8 - 72 bytes s='';s+=$_.upcase.scan(/./){s.sub!$&,''}while gets;$><<s.scan(/\w/).sort


Input is taken from stdin.

Sample usage:

$more in.dat Hello I love cat I love dog I love mommy Mommy loves daddy$ ruby fridge-letters.rb < in.dat
ACDDDEGHILLMMMOOSTVYY

• Output needs to be sorted. – Matt Apr 10 '14 at 7:28
• @Matt now fixed. – primo Apr 10 '14 at 8:04
• Nice. If your Perl is vaguely recent though, you'll want a space between /i and for. – tobyink Apr 10 '14 at 13:45

# Python - 20620419917714512911794 88 chars

print(''.join(c*max(l.lower().count(c)for l in open(f))for c in map(chr,range(97,123))))


I wasn't sure how I was supposed to obtain the file name, so at the moment the code assumes that it is contained in a variable named f. Please let me know if I need to change that.

• in the spirit of unix - you could read from stdin. – romaninsh Apr 10 '14 at 7:02
• always make the file name one character long... – user16402 Apr 10 '14 at 12:40
• @Tal I'm also new, but if it saves characters, why not? – user16402 Apr 10 '14 at 12:54
• By assuming f for the input filename and using uppercase (all magnet letters are uppercase anyway), you can get it down to 91: print(''.join([chr(i)*max(l.upper().count(chr(i))for l in open(f))for i in range(65,91)])) – Gabe Apr 10 '14 at 16:30
• @njzk2 well, if we run this in the console, in theory it would just print the result by itself... – Tal Apr 11 '14 at 15:54

## Ruby 1.9+, 51 (or 58 or 60)

a=*$< ?a.upto(?z){|c|$><<c*a.map{|l|l.count c}.max}


Assumes everything's in lowercase. Case insensitivity costs 7 characters via .upcase, while case insensitivity and lowercase output costs 9 characters via .downcase.

# R (156, incl. file read)

With table I construct the letter frequency table for each sentence. Then I end up with taking for each letter the maximum value.

a=c();for(w in tolower(read.csv(fn,h=F)$V1))a=c(a,table(strsplit(w,"")[]));a=tapply(seq(a),names(a),function(i)max(a[i]))[-1];cat(rep(names(a),a),sep="")  Ungolfed: a=c() words = read.csv(fn,h=F)$V1
for(w in tolower(words))
a=c(a, table(strsplit(w, "")[]))
a = tapply(seq(a), names(a), function(i) max(a[i]))[-1] ## The -1 excludes the space count.
cat(rep(names(a), a), sep="")


Solution:

acdddeghillmmmoooooostuvyy

• @lambruscoAcido you could vectorize the three first lines (of the ungolfed code) which would give you a=unlist(lapply(readLines(fn),function(x)table(strsplit(tolower(x),""))));a=tapply(seq(a),names(a),function(i)max(a[i]))[-1];cat(rep(names(a),a),sep=""), but it is only 3 characters shorter – jkd Feb 28 '18 at 20:48
• Another approach with only 112 characters would be cat(unlist(sapply(letters,function(i)rep(i,max(sapply(gregexpr(i,readLines(f)),function(x)sum(x>0)))))),sep="") assuming f is the filename – jkd Feb 28 '18 at 20:49

import Data.List
import Data.Char
main=interact$sort.filter(/=' ').foldl1(\x y->x++(y\\x)).lines.map toLower  The program reads from stdin and writes to sdtout. It is quite straightforward: it breaks the string into a list of lines, and rebuilds it by iterating on the list and adding the new letters contained in each line. • Oh wow why have I never heard of (\\) before? – Flonk Apr 10 '14 at 15:18 • – lortabac Apr 10 '14 at 15:50 # Perl 6: 5653 characters; 5855 bytes say |sort ([∪] lines.map:{bag comb /\S/,.lc}).pick(*)  For each line, this combs through it for the non-space characters of the lower-cased string (comb /\S/,.lc), and makes a Bag, or a collection of each character and how many times it occurs. [∪] takes the union of the Bags over all the lines, which gets the max number of times the character occurred. .pick(*) is hack-y here, but it's the shortest way to get all the characters from the Bag replicated by the number of times it occurred. EDIT: To see if it would be shorter, I tried translating histocrat's Ruby answer. It is 63 characters, but I still very much like the approach: $!=lines».lc;->$c{print$c x max $!.map:{+m:g/$c/}} for"a".."z"


Assuming the file is in file.txt!

import Data.Char
import Data.List


If file.txt contains, for example

abcde
abcdef
aaf


The script will output

aabcdef


Basically I'm appending the whole alphabet to each line, so that when grouping and sorting, I'm sure I'll end up with a list that contains 27 elements. Next, I transpose the "frequency table", so that each row in this array consists of the frequencies of a single letter in each line, e.g. ["a","","aaa","aa","aaaa"]. I then choose the maximum of each array (which works just like I want because of how the Ord-instance of Strings work), and drop the letter that I appended at the start, get rid of the spaces, and output the result.

• Instead of drop 1, just use tail – Bergi Apr 10 '14 at 23:55
• @Bergi Haha derp, thanks! I changed it in the post. – Flonk Apr 11 '14 at 11:29

C, 99 chars

t;main(c){for(--*t;++t[1+tolower(getchar())];);for(c=97;c<123;c++)while(t[c]--)putchar(c-1);}


It crashes if less than one newline is provided. I think it could be fixed quite easily.

## kdb (q/k): 59 characters:

d:.Q.a! 26#0
.z.pi:{d|:.Q.a##:'=_y}.z.exit:{-1@,/.:[d]#'!:d}

• generate pre-sorted seed dictionary from alphabet .Q.a
• process each line of input, convert to lowercase, group into dictionary, count each element, take alphabetic characters from result (I.e. prune spaces, newlines, etc at this stage) and use max-assign to global d to keep a running total.
• define exit handler, which gets passed in to .z.pi to save a delimiter but otherwise unused there. Take from each key-value to generate list of characters, flatten and finally print to stdout.

-1 adds a newline, using 1 would save a character but does not generate the output specified. Wish I could get rid of the .z.pi / .z.exit boilerplate, which would remove 14 characters.

Edit: avoid use of inter/asc by using seed dictionary.

for$:(a..z){$a[ord$:]|=$:x s/$://gi}}{print@a  Here's another Perl solution, reads from STDIN, requires -n switch (+1 to count), ties with primo's score but runs without complaints :-). It exploits the fact that bitwise or's result has longer string argument's length. • tried with my test and it worked great. – romaninsh Apr 21 '14 at 23:37 I'm adding my own solution: ## Bash - 72 Assumes that input is in file "i" for x in {A..Z};do echo -n cat i|sed "s/[^$x]//g"|sort -r|head -1;done


## Explanation

For each possible letter, filters it out only from input file resulting in something like this:

AAA
A
A

AAAA

A
AAAAAAAAAAAAAAAA


Then result is sorted and the longest line is selected. echo -n is there to remove newlines.

# Bash, 171159 158, 138 with junk output

Requires lowercase-only input. Assumes that the file is called _ (underscore). Maximum of 26 lines in the input file due to the annoying filenames which split creates (xaa, xab... xaz, ???).

In bash, {a..z} outputs a b c d e f ....

touch {a..z}
split _ -1
for l in {a..z}
do for s in {a..z}
do grep -so $l xa$s>b$l if [ wc -l<b$l -ge wc -l<$l ] then mv b$l $l fi done tr -d '\n'<$l
done


# Sample output

acdddeghillmmmoostvyy


# Explanation

touch {a..z}


Create files that we will be reading from later on so that bash doesn't complain that they don't exist. If you remove this line you will save 13 chars but get a lot of junk output.

split _ -1


Split the input file into sections, each storing 1 line. The files this command creates are named xaa, xab, xac and so on, I have no idea why.

for l in {a..z}
do for s in {a..z}


For each letter $l read through all lines stored in files xa$s.

do grep -so $l xa$s>b$l  Remove the -s switch to save 1 char and get a lot of junk output. It prevents grep from complaining about nonexistent files (will occur unless you have 26 lines of input). This processes the file xa$s, removing anything but occurences of $l, and sending output to the file b$l. So "i love mommy" becomes "mmm" with new lines after each letter when $l is m. if [ wc -l<b$l -ge wc -l<$l ]  If the number of lines in the file we just created is greater than or equal to (i.e. more letters since there is one letter per line) the number of lines in our highest result so far (stored in $l)...

then mv b$l$l


...store our new record in the file $l. At the end of this loop, when we have gone through all the lines, the file $l will store x lines each containing the letter $l, where x is the highest number of occurences of that letter in a single line. fi done tr -d '\n'<$l


gc a|%{[char[]]$_|group|%{$c=$_.name.tolower().trim()$n=$_.count;$x[$c]=($n,$x[$c])[$n-lt$x[$c]]}} ($x.Keys|sort|%{$_*$x[$_]})-join""  ## Groovy, 113/127 102/116 characters Assuming the file is all in one case (102 chars): t=new File('f').text;t.findAll('[A-Z]').unique().sort().each{c->print c*t.readLines()*.count(c).max()}  Assuming the file is in mixed case (116 chars): t=new File('f').text.toUpperCase();t.findAll('[A-Z]').unique().sort().each{c->print c*t.readLines()*.count(c).max()}  Basically: • t=new File('f').text To get the text of the file. • t.findAll('[A-Z]').unique().sort().each{c-> To get the unique characters, sort them, and iterate. • print c*t.readLines()*.count(c).max() Get the max occurances in a single line and print the character that many times. # Bash (mostly awk) - 172163 157 awk -v FS="" '{delete l;for(i=1;i<=NF;i++)l[toupper($i)]++;for(i in l)o[i]=(o[i]>l[i]?o[i]:l[i])}END{for(i in o)for(j=0;j<o[i];j++)print i}'|sort|tr -d ' \n'


Text needs to be piped in to awk (or specified as a file).

### Example Input

Hello
I love cat
I love dog
I love mommy


### Example Output

ACDDDEGHILLMMMOOSTVYY


# PHP (probably could be better) - 174 210

$o=array();foreach(explode("\n",$s) as $a){$l=array();$i=0;while($i<strlen($a)){$k=ucfirst($a[$i++]);if($k==' ')continue;$o[$k]=max($o[$k],++$l[$k]);}}ksort($o);foreach($o as$k=>$v)for($i=0;$i<$v;$i++)echo$k;


Assumes that the string is contained in the variable $s ### Example Input Hello I love cat I love dog I love mommy Mommy loves daddy  ### Example Output ACDDDEGHILLMMMOOSTVYY  I realize this probably isn't the most efficient answer, but I wanted to try and solve the problem anyways. Here's my ObjC variation: - (NSArray *) lettersNeededForString:(NSString *)sourceString { sourceString = [sourceString stringByReplacingOccurrencesOfString:@"\n" withString:@""]; sourceString = [sourceString stringByReplacingOccurrencesOfString:@" " withString:@""]; const char * sourceChars = sourceString.UTF8String; NSMutableArray * arr = [NSMutableArray new]; for (int i = 0; i < sourceString.length; i++) { [arr addObject:[NSString stringWithFormat:@"%c", sourceChars[i]]]; } return [arr sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)]; }  Then you can call it for whatever string: NSArray * letters = [self lettersNeededForString:@"Hello\nI love cat\nI love dog\nI love mommy\nMommy loves daddy"]; NSLog(@"%@",letters);  I was thinking about applications with larger amounts of text and I'd rather not have to count my array. For this, I added to the method to get this: - (NSDictionary *) numberOfLettersNeededFromString:(NSString *)sourceString { sourceString = [sourceString stringByReplacingOccurrencesOfString:@"\n" withString:@""]; sourceString = [sourceString stringByReplacingOccurrencesOfString:@" " withString:@""]; const char * sourceChars = sourceString.UTF8String; NSMutableArray * arr = [NSMutableArray new]; for (int i = 0; i < sourceString.length; i++) { [arr addObject:[NSString stringWithFormat:@"%c", sourceChars[i]]]; } static NSString * alphabet = @"abcdefghijklmnopqrstuvwxyz"; NSMutableDictionary * masterDictionary = [NSMutableDictionary new]; for (int i = 0; i < alphabet.length; i++) { NSString * alphabetLetter = [alphabet substringWithRange:NSMakeRange(i, 1)]; NSIndexSet * indexes = [arr indexesOfObjectsPassingTest:^BOOL(id obj, NSUInteger idx, BOOL *stop) { if ([[(NSString *)obj lowercaseString] isEqualToString:alphabetLetter]) { return YES; } else { return NO; } }]; masterDictionary[alphabetLetter] = @(indexes.count); } return masterDictionary; }  Run like: NSDictionary * lettersNeeded = [self numberOfLettersNeededFromString:@"Hello\nI love cat\nI love dog\nI love mommy\nMommy loves daddy"]; NSLog(@"%@", lettersNeeded);  Will give you: { a = 2; b = 0; c = 1; d = 4; e = 5; f = 0; g = 1; h = 1; i = 3; j = 0; k = 0; l = 6; m = 6; n = 0; o = 8; p = 0; q = 0; r = 0; s = 1; t = 1; u = 0; v = 4; w = 0; x = 0; y = 3; z = 0; } Which I think is better if I had a very large amount of text and I just needed to know how many of each letter I would need. # K, 34 {$a@<a:,/(.:a)#'!:a:|/#:''=:'0:x}


# Python 2, 154 bytes

import collections
c = collections.Counter()
for line in open("input.txt"):
c |= collections.Counter(line.upper())
print "".join(sorted(c.elements()))

• Welcome to PCG! This site supports Markdown syntax, which you can use to format your code, so that it appears nice: just indent each line of code 4 spaces. – algorithmshark Apr 10 '14 at 22:02
• You'll need to add the characters necessary to import collections. – isaacg Apr 11 '14 at 0:14
• does not answer the question, as you need the minimum amount of letters to write each sentence individually. In your code, you output the number of letters needed to write all sentences at the same time. – njzk2 Apr 11 '14 at 14:35
• You're missing an s at the end of the import statement and the with block lacks indentation. And since this is code golf, it would benefit you greatly to remove unnecessary whitespace where possible. – Fraxtil Apr 13 '14 at 1:56
• since this is code golf, remove the with statement (just loop over a call to open) and I don't think the elements need sorting. – RemcoGerlich Apr 13 '14 at 19:04

# C, 298 bytes

char c;
int j,n;
char C;
char D;
int main()
{
char a='a';
while((c=getchar())>=0)
{
c=tolower(c);
if(c>=a&&c<='z'){j=c-a;D[j]++;}
if(c=='\n'){
for(j=0;j<26;j++){
if(D[j]>C[j])
{C[j]=D[j];}
D[j]=0;
}
}
}
for(j=0;j<26;j++)
{
n=C[j];
while(n--)
{
putchar(a+j);
}
}
}


Array D holds tally of letters for each line, then the maximum count is copied to C.

Note: I put my answer yesterday but is now not listed, maybe I pressed delete instead of edit by mistake?

• It's only 271 bytes. You also have a lot of extraneous newlines. Also, you can you can omit the int from int main() and int j,n;. – nyuszika7h Apr 21 '14 at 19:59
• Also, your previous answer is still there. – nyuszika7h Apr 21 '14 at 20:01

## PHP, 143 bytes

Assuming that input is passed in variable $s: $i=explode("\n",$s);foreach(range('a','z')as$c){$x=array_map(function($l)use($c){return substr_count($l,$c);},$i);echo str_repeat($c,max($x));}


## Explanation

For each possible letter I'm mapping array containing list of strings through a user-defined function which replaces each line with number of characters used. For letter 'd' the line "Mommy loves daddy" will be mapped into 3.

Afterwards I find maximum value inside array and output letter just this many times. Here is multi-line version:

$i=explode("\n",$s);
foreach(range('A','Z')as $c){$x=array_map(function($l)use($c){
return substr_count($l,$c);
},$i); echo str_repeat($c,max(\$x));
}


# Python (209, with the sample included, 136 without.):

from collections import*;c=Counter()
for i in ["Hello","I love cat", "I love Dog", "I love mommy", "Mommy loves daddy"]:
for j in i.lower(): c[j]=max(c[j],list(i).count(j))
print "".join(sorted(c.elements()))
`

I'll post a PYG sample this afternoon.

• I had no idea Python strings had a count method... I don't suppose it's considered legit to change my answer to the question to use this new found knowledge? :p – Tal Apr 10 '14 at 7:16
• @tal They don't. It's a method of a list, if you look closer – ɐɔıʇǝɥʇuʎs Apr 10 '14 at 7:17
• Oh, I see... but in an unexpected twist it turns out strings apparently have this method as well (in 3.x anyway) – Tal Apr 10 '14 at 7:22
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