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

int main(){
	char ch;
	int number[26] = {};
	while(cin >> ch){
		ch = tolower(ch);
		if(isalpha(ch)){
			number[ch-'a']++;
		}
	}
	for(int i = 0; i < 26; i++){
		printf("%c : %d\n", i+'a', number[i]);
	}

	return 0;
}