Problem:
Score : 200 points

Problem Statement

A string is called a KEYENCE string when it can be changed to keyence by removing its contiguous substring (possibly empty) only once.

Given a string S consisting of lowercase English letters, determine if S is a KEYENCE string.

Constraints

The length of S is between 7 and 100 (inclusive).

S consists of lowercase English letters.

Input

Input is given from Standard Input in the following format:

S

Output

If S is a KEYENCE string, print YES; otherwise, print NO.

Sample Input 1

keyofscience

Sample Output 1

YES

keyence is an abbreviation of key of science.

Sample Input 2

mpyszsbznf

Sample Output 2

NO

Sample Input 3

ashlfyha

Sample Output 3

NO

Sample Input 4

keyence

Sample Output 4

YES

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.util.Scanner;

public class Main {

    private static final String KEYENCE = "keyence";
    private static final int K_LEN = KEYENCE.length();

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String S = scanner.next();

        scanner.close();

        if (S.equals(KEYENCE)) {
            System.out.println("YES");
            return;
        }

        int length = S.length();
        for (int i = 0; i < K_LEN; i++) {
            String s = S.substring(0, i) + S.substring(length - K_LEN + i, length);
            if (s.equals(KEYENCE)) {
                System.out.println("YES");
                return;
            }
        }

        System.out.println("NO");
    }
}