#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
typedef long long ll;
typedef pair<ll,ll> P;
typedef modint1000000007 mint;
#define rep(i,a,b) for(ll i=a;i<b;i++)
#define rrep(i,a,b) for(ll i=a;i>=b;i--)
const ll inf=1e12;
string s;
string t="kyoprotenkei90";
map<char,int> m;
int main(void){
    cin.tie(0);
    ios::sync_with_stdio(0);
    cin>>s;
    rep(i,0,s.size()){
        m[s[i]]=1;
    }
    rep(i,0,t.size()){
        if(m[t[i]]!=1){
            cout<<"No"<<endl;
            return 0;
        }
    }
    cout<<"Yes"<<endl;
}