#include <iostream>
#include <map>

using namespace std;

int main() {

    char str[100] = { 0 };
    cin.getline(str, sizeof(str));

    // 统计字符串中各字母字符对应的个数
    map<char,int> m;
    int i = 0;
    while(str[i]){
        if (isalpha(str[i]))
            m[str[i]]++;
        i++;
    }
    for (auto mi : m){
        cout << mi.first << ":" << mi.second << endl;
    }
    return 0;
}