#include <bits/stdc++.h>

using namespace std;

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

    vector<int> C(26), D(26);
    for (const auto &s: S)
        C[s - '0']++;
    for (const auto &t: T)
        D[t - '0']++;

    for (int i = 0; i < 26; i++){
        if (C[i] < D[i]){
            puts("No");
            return 0;
        }
    }

    puts("Yes");
}