#include <iostream>
#include <vector>
#include <string>
using namespace std;

double freq(string, char);

int main() {
	string input;
	vector<double> freqs(26);
	getline(cin, input);
	for (char c = 'A'; c <= 'Z'; ++c)
		freqs[int(c) - 65] = freq(input, c);
	for (int i = 0; i < 26; ++i)
		cout << char(i + 65) << ": " << 100*freqs[i] << "%\n";
}

double freq(string s, char a) {
	double f = 0.;
	for (int i = 0; i < s.length(); ++i)
		if (s[i] == a) ++f;
	return f / s.length();
}