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

int main()
{
  string s;
  cin >> s;
  string t = "kyoprotenkei90";
  vector<int> a(256), b(256);
  for (auto& c : t) {
    a[c]++;
  }
  for (auto& c : s) {
    b[c]++;
  }
  cout << (a == b ? "Yes" : "No") << endl;
}