#include <bits/stdc++.h>

using namespace std;
#define rep(i,n) for(int i=0;i<n;++i)
#define rep1(i,n) for(int i=1;i<=n;++i)
#define debug(output) if(debugFlag)cout<<#output<<"= "<<output<<endl
using lint = long long;
typedef pair<int,int> P;
const bool debugFlag=true;
const lint linf=1e18+7;
const lint inf=1e9+7;
const int MOD=1000000007;
signed main(){
  string s;cin>>s;
  string x="kyoprotenkei90";
  sort(x.begin(),x.end());
  sort(s.begin(),s.end());
  if(x==s){
    cout<<"Yes"<<endl;
  }
  else{
    cout<<"No"<<endl;
  }
  return 0;
}