#include <iostream>
#include <string>
using namespace std;
#define YES cout << "Yes" << endl
#define NO cout << "No" << endl

int main(void){
    string base = "kyoprotenkei90", s;
    cin >> s;
    int pos = -1;
    for (int i = 0; i < 14; i++) {
        pos = base.find(s.substr(i, 1));
        if (pos != string::npos) base.erase(pos, 1);
    }
    base.size() == 0 ? YES : NO;
}