#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
  #define _GLIBCXX_DEBUG
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

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