import java.util.Scanner;

public class Main{
	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		long n=sc.nextLong()/1000;
		long x=n%86400;
		//System.out.print(x);
		long ans1=x/3600;//小时数
		long ans2=x-ans1*3600;
		long ans3=ans2/60;//分钟数
		long ans4=ans2-ans3*60;//秒数
		
		if(ans1<10)		System.out.print("0");
		System.out.print(ans1);
		System.out.print(":");
		if(ans3<10)		System.out.print("0");
		System.out.print(ans3);
		System.out.print(":");
		if(ans4<10)		System.out.print("0");
		System.out.print(ans4);
	}
}