#include <bits/stdc++.h>
using namespace std;

int main() {
	string s;
	cin >> s;

	int h = stoi(s.substr(0, 2)),
		m = stoi(s.substr(3, 2));
	//cout << h << m << endl;

	m += 5;
	if (m >= 60) {
		m -= 60;
		h++;
	}
	if (h >= 24) {
		h -= 24;
	}

	if (h < 10) cout << 0;
	cout << h << ':';
	if (m < 10) cout << 0;
	cout << m << endl;
}