#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cstdio>
#include <cstring>
#include <cmath>
using namespace std;

int main() {
    int a, b;
    cin >> a >> b;

    string s;
    cin >> s;

    a += 24 - 9;
    b += (int)(atof(s.substr(3).c_str()) * 60) + 24 * 60;
    a += b / 60; b %= 60;
    a %= 24;

    printf("%02d:%02d\n", a, b);

    return 0;
}