#include<iostream>
#include<stdio.h>
#include<string.h>
#include<queue>
using namespace std;

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  FOR(i,0,n)
typedef long long ll;

int main()
{
	char a[5];
	REP(i, 5) { cin >> a[i]; }
	int ten, one; ten = ((int)a[0] - (int)'0') * 10 + (int)a[1] - (int)'0'; one = ((int)a[3] - (int)'0') * 10 + (int)a[4] - (int)'0';
	one += 5;
	if (one >= 60) { ten += 1; one -= 60;  }
	if (ten >= 24) { ten -= 24; }
	if (!(ten / 10)) {
		cout << "0";
	}
	cout << ten<<":";
	if (!(one / 10)) {
		cout << "0";
	}
	cout << one;
 cout << endl;
	return 0;
}