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

int main() {
  int h, m;
  char c;
  cin >> h >> c >> m;
  m += 5;
  if (m >= 60) {
    h += 1;
    m %= 60;
  }
  if (h == 24) {
    h = 0;
  }
  cout << setw(2) << setfill('0') << h;
  cout << ":";
  cout << setw(2) << setfill('0') << m << endl;
  return 0;
}