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

int main() {
	int H, M;
	char c;
	cin >> H >> c >> M;
	M += 5;
	if (M >= 60) M -= 60, H++;
	H = H % 24;
	cout << setw(2) << setfill('0') << H << ":" << setw(2) << setfill('0') << M << endl;
}