#include <bits/stdc++.h>
using namespace std;
int main(){
  int hh;
  char c;
  int mm;
  cin >> hh >> c >> mm;
  mm += 5;
  if (mm >= 60){
    mm -= 60;
    hh++;
  }
  if (hh >= 24){
    hh -= 24;
  }
  cout << hh << c << mm << endl;
}