#include <bits/stdc++.h>
using namespace std;
#define repd(i,a,b) for (int i=(a);i<(b);i++)
#define rep(i,n) repd(i,0,n)
#define all(x) (x).begin(),(x).end()
#define SIZE(x) ll(x.size())
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
typedef long long ll;
const long long INF = 1LL << 60;
const long long MOD = 1000000007;
typedef pair<int, int> P;
int main()
{
    string S;
    cin >> S;

    string T = "kyoprotenkei90";
    rep(i, S.size()) {
        rep(j, T.size()) {
            if (S[i] == T[j]) T[j] = '-';
        }
    }

    rep(i, T.size()) {
        if (T[i] != '-') {
            cout << "No" << endl;
            return 0;
        }
    }

    cout << "Yes" << endl;
    return 0;
}