#include <bits/stdc++.h>
using namespace std;
#define rep(i,l,r) for(int i=(l);i<(r);++i)
typedef long long ll;

int main(){
	string s; cin>>s;
	string r="kyoprotenkei90";
	sort(s.begin(),s.end());
	sort(r.begin(),r.end());
	if(s==r) cout<<"Yes"<<endl;
	else cout<<"No"<<endl;
}