import java.util.*;



public class MyTime {




    public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    Date d = new Date(long );
    long number = input.nextLong();
    long totalMilliseconds = System.currentTimeMillis();
    long totalSeconds = totalMilliseconds/1000;
    long currentSecond = totalSeconds % 60;
    long totalMinutes = totalSeconds/60;
    long currentMinute = totalMinutes % 60;
    long totalHours = totalMinutes/60;
    long currentHour = totalHours % 24;
        System.out.println( d+ ":" +currentHour+ ":" +currentMinute+ ":" +currentSecond+ " GMT");
    }


}