#include<bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
using pint = pair<int, int>;
using pll = pair<ll, ll>;

int main(){
    string S; cin >> S;
    string jud = "kyoprotenkei90";
    sort(S.begin(), S.end());
    sort(jud.begin(), jud.end());
    cout << (S == jud ? "Yes": "No") << endl;
}