import java.util.Calendar;
public class Main {
public static void main(String args[]) {
Calendar cal1 = Calendar.getInstance();
Calendar cal2 = Calendar.getInstance();
cal2.add(Calendar.HOUR, 2);
cal2.add(Calendar.MINUTE, 42);
cal2.add(Calendar.SECOND, 12);
long secs = (cal2.getTimeInMillis() - cal1.getTimeInMillis()) / 1000;
String display = String.format("%02d:%02d:%02d", secs / 3600, (secs % 3600) / 60, (secs % 60));
System.out.println(display);
}
}