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

int main(){
    string S;
    cin >> S;

    string T = "kyoprotenkei90";
    sort(S.begin(), S.end());
    sort(T.begin(), T.end());

    cout << (S == T ? "Yes" : "No") << endl;
    return 0;
}