import java.util.Scanner;


public class prog {
	public static String regex(String str) {
		if (str.contains("Yardi")) {
			return "YES";
		}
		
		return "NO";
	}
	
	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		String str = s.next();
		
		System.out.println(regex(str));
		
		s.close();		
	}
}