hehehehehe

#include <bits/stdc++.h>
using namespace std;
map<char, int> m;
int main(){
    string s;
    getline(cin, s);
    int len = s.length();
    for(int i = 0; i < len; i++){
        if(s[i] >= 'A' and s[i] <= 'Z'){
            s[i] += 32;
        }
    }
    for(int i = 0; i < len; i++){
        if(s[i] >= 'a' and s[i] <= 'z'){
            m[s[i]]++;
        }
    }
    map<char, int> :: iterator it;
    for(it = m.begin(); it != m.end(); it++){
        cout << it->first << ":" << it->second << endl;
    }
    return 0;
}