#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i = 0; i < (int)n; i++)
using ll = long long;

int main(){
  string s;
  cin >> s;
  string t = "kyoprotenkei90";
  map<char,int> mps, mpt;
  for(auto c : t) mpt[c]++;
  for(auto c : s) mps[c]++;
  bool can = true;
  for(auto x : mpt) if(x.second != mps[x.first]) can = false;
  cout << (can ? "Yes" : "No") << endl;
  return 0;
}