#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define srep(i, s, t) for (int i = s; i < t; ++i)
#define drep(i, n) for (int i = (n)-1; i >= 0; --i)
using namespace std;
typedef long long int ll;
typedef pair<int, int> P;
#define yn           \
    { puts("YES"); } \
    else {           \
        puts("NO");  \
    }
#define MAX_N 200005

int main() {
    string s;
    cin >> s;
    sort(s.begin(), s.end());
    string t = "kyoprotenkei90";
    sort(t.begin(), t.end());
    if (s == t) {
        puts("Yes");
    } else {
        puts("No");
    }
    return 0;
}