import java.lang.reflect.Array;
import java.util.*;

class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        char[] c = sc.next().toCharArray();
        Arrays.sort(c);
        char[] input = "kyoprotenkei90".toCharArray();
        Arrays.sort(input);

        if (input.length != c.length){
            System.out.print("No");
            return;
        }

        for (int i = 0; i < c.length; i++){
            if (c[i] != input[i]){
                System.out.print("No");
                return;
            }
        }
        System.out.print("Yes");

    }
}