#include <bits/stdc++.h>
#include<iostream>
#include<map>
#include<vector>
#include <algorithm>
#include<math.h>
#include <iomanip>
#include<set>
#include <numeric>
#include<string>
using ll = long long;
using namespace std;

int main()
{
    string s, t = "kyoprotenkei90";
    cin >> s;
    for (int i = 0; i < 14; i++){
        auto pos = s.find(t[i]);
        if (pos != string::npos) s.erase(pos, 1);
    }
    cout << (!(s.size()) ? "Yes" : "No") << endl;
}