import java.util.Arrays;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		sc.close();
		
		char[] kyo = "kyoprotenkei90".toCharArray();
		Arrays.sort(kyo);
		
		char[] cc = S.toCharArray();
		Arrays.sort(cc);
		
		for ( int i = 0 ; i < kyo.length ; i++ ) {
			if ( kyo[i] != cc[i] ) {
				System.out.println("No");
				return;
			}
		}

		System.out.println("Yes");
	}
}