#include <iostream>
#include <string>
#include <stdlib.h>

using namespace std;

int main(int argc,char *argv[]) {
    string tmp;
    cin >> tmp;
    unsigned int sec = strtoul(tmp.c_str(), NULL, 10);
    int div = (sec / 60); 
    int mod = (sec % 60);
    if (sec < 0) {
        cout << "00:00";
    } else {
        cout << div << ":";
        if (mod < 10) {
            cout << "0" << mod << endl;
        } else {
            cout << mod << endl;
        }
    }
    return 0;
}