#include<cstdio>
#include<iostream>
#include<cctype>
using namespace std;

int main(){
  char ch;
  int cnt[26] = {};

  while( cin >> ch ){
    ch = tolower(ch);
    if( isalpha(ch) ){
      cnt[ch-'a']++;
    }
  }

  for(int i = 0; i < 26; i++){
    printf("%c : %d\n", i+'a', cnt[i]);
  }
  
  return 0;
}