#include <bits/stdc++.h>
using namespace std;

int main()
{
	string S;
	cin >> S;

	string s = "kyoprotenkei90";
	int N = s.size();
	string ans = "Yes";
	for( int i = 0; i < N; i++ ) {
		auto pos = S.find( s[i] );
		if( pos == string::npos ) {
			ans = "No";
			break;
		}
		S.erase( pos, 1 );
	}

	cout << ans << endl;
}