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

int main() {
	int h,m;
	scanf("%d:%d",&h,&m);
	m+=5;
	if(m>59){
		h=(h+1)%24;
		m-=60;
	}
	printf("%02d:%02d\n",h,m);
	return 0;
}