#include <bits/stdc++.h>
#include <atcoder/all>
#define ll long long int
#define INF 1000000000000000000
using namespace atcoder;
using namespace std;

int main(void){
  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;
  
  

  return 0;
}