#include<iostream>
#include<algorithm>
#include <vector>
#include<cmath>
using namespace std;
typedef long long int lont;
int main() {
	int H, M;
	char T;
	cin >> H >> T >> M;
	M += 5;
	H += M / 60;
	H = H % 24;
	M = M % 60;
	if (H < 10 && M < 10) cout << 0 << H << T << 0 << M;
	if (H >= 10 && M < 10) cout <<  H << T << 0 << M;
	if (H < 10 && M >= 10) cout << 0 << H << T  << M;
	if (H >= 10 && M >= 10) cout <<  H << T  << M;
}