#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, n) for(int i = 0; i < (n); i++)
#define rep1(i, n) for(int i = 1; i <= (n); i++)
#define co(x) cout << (x) << "\n"
#define cosp(x) cout << (x) << " "
#define ce(x) cerr << (x) << "\n"
#define cesp(x) cerr << (x) << " "
#define pb push_back
#define mp make_pair
#define Would
#define you
#define please

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);


	int A, B;
	char C;
	cin >> A >> C >> B;

	B += 5;
	if (B >= 60) {
		B -= 60;
		A++;
		if (A >= 24) A -= 24;
	}

	cout << setfill('0') << setw(2) << A << ':' << setw(2) << B << endl;


	Would you please return 0;
}