import java.util.*;

public class Main {
    private static boolean match(String s, int[] perm, String target){
        if(s.length() != target.length()) return false;
        for(int i=0; i<s.length(); i++){
            if(s.charAt(perm[i]) != target.charAt(i)) return false;
        }
        return true;
    }
    public static void main(String[] args) throws Exception{
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        final String target = "kyoprotenkei90";
        boolean found = false;
        //全ての並べ替え方を試します. 14! = 8.7E10[通り]程度なので間に合いません
        for(int[] perm: new Permutation(target.length())){
            if(match(s, perm, target)) found = true;
        }
        System.out.println(found ? "Yes" : "No");
    }
}
/*以下, ACLibraryForJavaを利用. 内部実装が気になる人以外は読まなくてOKです*/
/*ドキュメントはこちら→ https://github.com/NASU41/AtCoderLibraryForJava/tree/master/Permutation */
class Permutation implements java.util.Iterator<int[]>, Iterable<int[]> {
    private int[] next;

    public Permutation(int n) {
        next = java.util.stream.IntStream.range(0, n).toArray();
    }

    @Override
    public boolean hasNext() {
        return next != null;
    }

    @Override
    public int[] next() {
        int[] r = next.clone();
        next = nextPermutation(next);
        return r;
    }

    @Override
    public java.util.Iterator<int[]> iterator() {
        return this;
    }

    public static int[] nextPermutation(int[] a) {
        if (a == null || a.length < 2)
            return null;
        int p = 0;
        for (int i = a.length - 2; i >= 0; i--) {
            if (a[i] >= a[i + 1])
                continue;
            p = i;
            break;
        }
        int q = 0;
        for (int i = a.length - 1; i > p; i--) {
            if (a[i] <= a[p])
                continue;
            q = i;
            break;
        }
        if (p == 0 && q == 0)
            return null;
        int temp = a[p];
        a[p] = a[q];
        a[q] = temp;
        int l = p, r = a.length;
        while (++l < --r) {
            temp = a[l];
            a[l] = a[r];
            a[r] = temp;
        }
        return a;
    }
}