#include <iostream>
#include <string>
#include <map>
#include <algorithm>

using namespace std;


int main() {
    string a;
    getline(cin, a);
    map<char, int> a1;
    for (int i = 0; i < a.size(); ++i) {
        ++a1[a[i]];
    }
    for (auto it = a1.begin(); it != a1.end(); ++it) {
        cout << it->first << " : " << it->second << endl;
    }

    return 0;
}