#include <iostream>
#include <string>
#include <vector>
#include <algorithm>

using namespace std;

int main()
{
    string readable_text;
    getline(cin, readable_text);

    // Write an answer using cout. DON'T FORGET THE "<< endl"
    // To debug: cerr << "Debug messages..." << endl;

    cout << "HH:MM" << endl;
}