#include <iostream>
#include <functional>
#include <algorithm>
#include <vector>
using namespace std;

typedef long long ll;
ll i,n,a,b,c,ans;
vector<ll> vec;

int main(){
  scanf("%lld:%lld",&n,&a);
  a += 5;
  if(a > 59){
    n += 1;
    a -= 60;
  }
  if(n > 23)n = 0;
  printf("%02lld:%02lld\n",n,a);
  return 0;
}