import java.util.Scanner;
import java.util.regex.Pattern;


public class prog {
    public static void main (String[] args) throws java.lang.Exception
    {
        Scanner scanner = new Scanner(System.in);
        String str = scanner.nextLine();
        System.out.println(Pattern.matches(".*Yardi.*", str) ? "YES" : "NO");
        scanner.close();
    }
}