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

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

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

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