
import java.util.Scanner;
public class Main {

    public static void main(String[] args) {
        Scanner a = new Scanner(System.in);
        int sec = a.nextInt();
        if (sec >= 0 && sec < 86400){
            int hours = sec / 3600;
            int minutes = (sec % 3600) / 60;
            int second = (sec % 3600) % 60;

            System.out.println(hours + ":" + minutes + ":" + second);
        }else{
            System.out.println("No");
        }
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz