import java.util.*;
import java.lang.*;
import java.io.*;

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

class Main
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Scanner sc = new Scanner(System.in);
		int S = sc.nextInt();
		int h = S / 3600;
		int m = (S - 3600 * h) / 60;
		int s = S % 60;
		System.out.println(h+":"+m+":"+s);
	}
}