//inlclude前用define 
#define _USE_MATH_DEFINES

//include
#include<iostream>
#include<string>
#include<algorithm>
#include<vector>
#include<cmath>
#include<cstdio>
#include<type_traits>
#include<numeric>
#include<limits>
using namespace std;
//typedef
typedef vector<int> VI;
typedef vector<string> VS;
typedef vector<char> VC;

//grobal変数


int main() {
	int h, m;
	char a;
	cin >> h >> a >> m;
	m += 5;
	if (m >= 60) {
		m -= 60;
		h++;
	}
	if (h >= 24) {
		h -= 24;
	}
	printf("%01d%c%01d\n", h,a,m);
	return 0;

}