import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        char[] base = "kyoprotenkei90".toCharArray();
        Arrays.sort(base);
        char[] chars = sc.next().toCharArray();
        Arrays.sort(chars);
        if (base.length != chars.length) {
            System.out.println("No");
            return;
        }
        for (int i = 0; i < chars.length; i++) {
            if (base[i] != chars[i]) {
                System.out.println("No");
                return;
            }
        }
        System.out.println("Yes");
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public String next() throws Exception {
        if (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
}