#include <bits/stdc++.h>
using namespace std;
int main(){
  string S;
  cin >> S;
  string T = "kyoprotenkei90";
  sort(S.begin(), S.end());
  sort(T.begin(), T.end());
  if (S == T){
    cout << "Yes" << endl;
  } else {
    cout << "No" << endl;
  }
}