#include <bits/stdc++.h>

using namespace std;

int main(){
    string S;
    cin >> S;
    string T = "kyoprotenkei90";

    map<char, int> C, D;
    for (const auto &s: S)
        C[s]++;
    for (const auto &t: T)
        D[t]++;

    for (const auto &[k, v]: D){
        if (C[k] < v){
            puts("No");
            return 0;
        }
    }

    puts("Yes");
}