public class Frame_1_5_4 {

	public static void main(String[] args) {
		long timeAmount = System.currentTimeMillis() / 1000;
		long partS = timeAmount % 60;
		long partM = (timeAmount / 60) % 60;
		long partH = ((timeAmount / 60) /60 ) % 24;
		long partD = ((timeAmount / 60) /60 ) / 24;
		System.out.println(partD+":"+partH+":"+partM+":"+partS);

	}

}