#include <iostream>
#include <string>
using namespace std;
int main() {
	int h, m;
	cin >> h >> m;
	m += 5;
	if (m >= 60) {
		h++;
		m -= 60;
	}
	if (h == 24) {
		h = 0;
	}

	if (h < 10) {
		if (m < 10) {
			cout << "0" << h << ":0" << m << endl;
		}
		else if (m >= 10) {
			cout << "0" << h << ":" << m << endl;
		}
	}

	if (h >= 10) {
		if (m < 10) {
			cout << h << ":0" << m << endl;
		}
		else if (m >= 10) {
			cout <<  h << ":" << m << endl;
		}
	}
	return 0;
}