import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int a = scan.nextInt();
		scan.close();
		int h = a / 100;
		int m = a % 100 * 6 / 10;
		if(m < 10) {
			System.out.println(h + 10 + ":0" + m);
		}else {
			System.out.println(h + 10 + ":" + m);
		}
	}
}