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

#define REP(i,n) for(int i=0;i<(n);i++)
#define ALL(v) v.begin(),v.end()

int main(){
  string s,t;cin>>s;
  t="90kyoprotenkei";
  sort(ALL(s));
  sort(ALL(t));
  if(s==t)cout<<"Yes"<<endl;
  else cout<<"No"<<endl;
}