#include<bits/stdc++.h>
using namespace std;
using ll=long long;
constexpr ll mod=1e9+7;

int main()
{
  cin.tie(0);
  ios_base::sync_with_stdio(false);
  string s;
  cin>>s;
  map<char, int> mp;
  for (const auto& e: s) {
    mp[e]++;
  }
  string t = "kyoprotenkei90";
  for (const auto& e: t) {
    mp[e]--;
  }
  for (const auto& e: mp) {
    if (e.second != 0) {
      cout << "No\n";
      return 0;
    }
  }
  cout << "Yes\n";
}