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

ll mod = 1000000007;

int main() {
    string S; cin >> S;
    string ans = "No";
    multiset<char> s;
    rep(i,S.size()){
        s.insert(S[i]);
    }
    string T = "kyoprotenkei90";
    rep(i,T.size()){
        s.erase(T[i]);
    }
    if(s.empty()) ans = "Yes";
    cout << ans << endl;
}