#include "bits/stdc++.h"

using namespace std;
using ll = long long;

void Main() {
    string S;
    cin >> S;
    string a = "kyoprotenkei90";
    map<char, int> mS, ma;
    for (char c : S) {
        if (mS.count(c) == 0) {
            mS.insert(make_pair(c, 0));
        }
        ++mS[c];
    }
    for (char c : a) {
        if (ma.count(c) == 0) {
            ma.insert(make_pair(c, 0));
        }
        ++ma[c];
    }
    if (ma.size() != mS.size()) {
        cout << "No" << endl;
        return;
    }
    for (auto e : ma) {
        if (mS[e.first] != e.second) {
            cout << "No" << endl;
            return;
        }
    }
    cout << "Yes" << endl;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    std::cout << std::fixed << std::setprecision(15);
    Main();
    return 0;
}