#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;

int main() {
  string S; cin >> S;
  string T = "kyoprotenkei90";
  int s = 0, t = 0;
  for(int i = 0; i < (int)S.size(); i++){
    s += S[i], t += T[i];
  }
  if(s == t) cout << "Yes" << endl;
  else cout << "No" << endl;
}