#include <iostream>
#include <string>
#include <cassert>
#include <algorithm>
using namespace std;

int main() {
	string S; cin >> S;
	string T = "kyoprotenkei90";
	sort(S.begin(), S.end());
	sort(T.begin(), T.end());

	assert(S.size() == 14);
	for (int i = 0; i < S.size(); i++) {
		assert(('a' <= S[i] && S[i] <= 'z') || ('0' <= S[i] && S[i] <= '9'));
	}

	if (S == T) cout << "Yes" << endl;
	else cout << "No" << endl;
	return 0;
}