#include <bits/stdc++.h>
using namespace std;
#define bokusunny ios::sync_with_stdio(false), cin.tie(nullptr);

void solve() {
  string S;
  cin >> S;

  string ans = "kyoprotenkei90";
  sort(ans.begin(), ans.end());
  sort(S.begin(), S.end());

  if (S == ans) {
    cout << "Yes" << endl;
  } else {
    cout << "No" << endl;
  }
}

int main() {
  bokusunny;
  solve();

  return 0;
}