#include <iostream>

using namespace std;

int main() {
    int h, m;
    char c;

    cin >> h >> c >> m;

    m += 5;

    if(m > 59) {
        m %= 60;
        h++;
    }
    if(h > 23) {
        h = 0;
    }

    if(h < 10) {
        cout << "0"; 
    }
    cout << h << ":";

    if(m < 10) {
        cout << "0"; 
    }
    cout << m << endl;


    return 0;
}