#include<iostream>
#include<vector>
#include<algorithm>
#include<cmath>
#include<string>
#include<iomanip>
#include<numeric>
#include<queue>
#include<deque>
#include<stack>
#include<set>
#include<map>
#include<random>
using namespace std;
typedef long long ll;
const int mod=1e9+7;
int main(){
	string s,t="kyoprotenkei90";
	cin>>s;
	sort(s.begin(),s.end());
	sort(t.begin(),t.end());
	cout<<(s==t?"Yes":"No")<<endl;
}