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

class Main
{
    public static void main(String args[])throws Exception
    {
        BufferedReader bu=new BufferedReader(new InputStreamReader(System.in));
        StringBuilder sb=new StringBuilder();
        String s=bu.readLine(),t="kyoprotenkei90";
        int c[]=new int[200],i;
        for(i=0;i<t.length();i++) c[t.charAt(i)]++;
        for(i=0;i<s.length();i++) c[s.charAt(i)]--;
        boolean pos=true;
        for(i=0;i<200;i++) pos&=c[i]==0;
        if(pos) sb.append("Yes\n");
        else sb.append("No\n");
        System.out.print(sb);
    }
}