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

int max(int a, int b) {
	int x = (a > b) ? a : b;
	return x;
}

int min(int a, int b) {
	int x = (a < b) ? a : b;
	return x;
}

int main() {
	int h, m;
	char c;
	cin >> h >> c >> m;
	m += 5;
	if (m > 59) {
		m -= 60;
		h++;
		if (h > 23) {
			h -= 24;
		}
	}
	printf("%02d:%02d", h, m);

	return 0;
}