#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i,n) for(int i=0;i<n;i++)
#define int long long
static const ll mod=998244353;

signed main(){
  map<char,int>mp1;
  map<char,int>mp2;  
  string t="kyoprotenkei90";
  int tlen=t.length();
  rep(i,tlen) mp1[t[i]]++;
  string s;
  cin>>s;
  int len=s.length();
  rep(i,len) mp2[s[i]]++;
  if(mp1==mp2) cout<<"Yes"<<endl;
  else cout<<"No"<<endl;
  return 0;
}