#include <iostream>
#include <iomanip>

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