#include <iostream>

using namespace std;

int r(double d) {
    double r = d - int(d);
    if (r < 0.5) {
        return int(d);
    } else {
        return int(d) + 1;
    }
}

int main() {
    double a, b, c;
    cin >> a >> b >> c;
    double s = 0;
    s = r(c / 6);
    if (s == 60) {
        s = 0;
    }
    double m = r((b - (s / 10)) / 6);
    if (m == 60) {
        m = 0;
    }
    double h = r((a - (s / 600) - (m / 10)) / 30);
    if (h == 60) {
        h = 0;
    }
    if (h < 10)
        cout << "0";
    cout << h << ":";
    if (m < 10)
        cout << "0";
    cout << m << ":";
    if (s < 10)
        cout << "0";
    cout << s << "\n";
}