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: Wrong Answer)

import java.util.*;

public class Main {

    public static void main(String[] args) {
        // write your code here
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        String target = "keyence";

        if (s.contains(target)) {
            System.out.println("YES");
            return;
        }

        for (int i = 1; i < target.length(); i++) {
            int fi;
            if ((fi = s.indexOf(target.substring(0, i))) == - 1) {
                continue;
            }
            if (s.indexOf(target.substring(i), fi + i) > 0) {
                System.out.println("YES");
                return;
            }
        }

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