#include <iostream>
#include <string>
#include <algorithm>
#include <functional>
#include <vector>
#include <stack>
#include <queue>
#include <set>
#include <map>
#include <cstdio>
#include <cmath>
#include <tuple>
#define int long long
#define rep(i, n) for(i = 0; i < n; i++)
using namespace std;

string t = "kyoprotenkei90";
int cnt[300];

signed main() {
	string s;
	cin >> s;
	
	for (int i = 0; i < t.length(); i++) {
		cnt[t[i]]++;
	}
	for (int i = 0; i < s.length(); i++) {
		cnt[s[i]]--;
	}
	
	for (int i = 0; i < 300; i++) {
		if (cnt[i] != 0) {
			cout << "No" << endl;
			return 0;
		}
	}
	
	cout << "Yes" << endl;
	return 0;
}