#include <bits/stdc++.h> using namespace std; int hh, mm, n = 15; char a;

int main() { cin >> hh >> a >> mm; if (hh < n) { n = n - hh; n = 24 - n; hh = n; if (hh < 10) { cout << 0 << hh << a; } else { cout << hh << a; } if (mm < 10) { cout << 0 << mm; } else { cout << mm; } } else { hh -= 15; if (hh < 10) { cout << 0 << hh << a; } else { cout << hh << a; } if (mm < 10) { cout << 0 << mm; } else { cout << mm; } } return 0; }