#include <iostream>
#include <iomanip>
using namespace std;

int main() {
    int hour, minute;
    while ( cin >> hour >> minute ) {
        minute += 30;
        hour += 2 + ( minute / 60 );
        cout << setw ( 2 ) << setfill ( '0' ) << hour % 24 << ":" << setw ( 2 ) << setfill ( '0' ) << minute % 60 << endl;
    }
}