import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        System.out.println(solve(n));
    }
    
    static String solve(int n) {
        int hour = 10 + n / 100;
        int min = n % 100 /10 * 6;
        return hour +":" + String.format("%02d",min);
    }
}