import java.util.*;

public class Main {
	public static void main(String[] args) {
		@SuppressWarnings("resource")
		Scanner sc = new Scanner(System.in);
		int s = sc.nextInt();
		int h = s / 3600;
		s = s % 3600;
		int m = s / 60;
		s = s % 60;
		System.out.println(h + ":" + m + ":" + s);
	}
} import java.util.*; util.* java public class Main {
	public static void main(String[] args) {
		@SuppressWarnings("resource")
		Scanner sc = new Scanner(System.in);
		int s = sc.nextInt();
		int h = s / 3600;
		s = s % 3600;
		int m = s / 60;
		s = s % 60;
		System.out.println(h + ":" + m + ":" + s);
	}
} Main public static void main(String[] args) {
		@SuppressWarnings("resource")
		Scanner sc = new Scanner(System.in);
		int s = sc.nextInt();
		int h = s / 3600;
		s = s % 3600;
		int m = s / 60;
		s = s % 60;
		System.out.println(h + ":" + m + ":" + s);
	} main {
		@SuppressWarnings("resource")
		Scanner sc = new Scanner(System.in);
		int s = sc.nextInt();
		int h = s / 3600;
		s = s % 3600;
		int m = s / 60;
		s = s % 60;
		System.out.println(h + ":" + m + ":" + s);
	} @SuppressWarnings("resource")
		Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int s = sc.nextInt(); s sc.nextInt() sc.nextInt sc int h = s / 3600; h s / 3600 s 3600 s = s % 3600 s s % 3600 s 3600 int m = s / 60; m s / 60 s 60 s = s % 60 s s % 60 s 60 System.out.println(h + ":" + m + ":" + s) System.out.println System.out System System.out h + ":" + m + ":" + s ":" m h + ":" + m + ":" + s h ":" m ":" s String[] args args public class Main {
	public static void main(String[] args) {
		@SuppressWarnings("resource")
		Scanner sc = new Scanner(System.in);
		int s = sc.nextInt();
		int h = s / 3600;
		s = s % 3600;
		int m = s / 60;
		s = s % 60;
		System.out.println(h + ":" + m + ":" + s);
	}
} public class Main {
	public static void main(String[] args) {
		@SuppressWarnings("resource")
		Scanner sc = new Scanner(System.in);
		int s = sc.nextInt();
		int h = s / 3600;
		s = s % 3600;
		int m = s / 60;
		s = s % 60;
		System.out.println(h + ":" + m + ":" + s);
	}
} Main
import java.util.*;

public class Main {
	public static void main(String[] args) {
		@SuppressWarnings("resource")
		Scanner sc = new Scanner(System.in);
		int s = sc.nextInt();
		int h = s / 3600;
		s = s % 3600;
		int m = s / 60;
		s = s % 60;
		System.out.println(h + ":" + m + ":" + s);
	}
}