import java.util.Scanner;

public class MQ5 {
    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        System.out.println("请输入一个数");
        long a = sc.nextLong();
        System.out.println(a/3600+":"+(a%3600)/60+":"+(a%3600)%60);



    }
}