#include <bits/stdc++.h>
#include <assert.h>
using namespace std;
const long long MOD1 = 1000000007;
const long long MOD2 = 998244353;
#define logn long
#define lnog long
#define lgon long
#define itn int
typedef long long ll;
typedef pair<long long, long long> P;
const long long INF = 1e18;
int main(){
    string S; cin >> S;
    string T = "kyoprotenkei90";
    sort(S.begin(),S.end());
    sort(T.begin(),T.end());
    if (S==T){
        cout<<"Yes"<<endl;
    }
    else cout << "No" <<endl;
}