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

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

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

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

	return 0;
}