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.io.*;

import java.text.*;
import java.util.*;

public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		char[] strKey = {'k','e','y','e','n','c','e',};
		char[] S = sc.nextLine().toCharArray();
		int i = 0;
		int x = -1;
		
		String msg = "NO";
		
		for (char c:S) {
			if (c == strKey[i]) {
				i++;
				if (i == 6) {
					msg = "YES";
					break;
				}
				if (x == -1) {
					x = i;
				}
				if (x != i) {
					break;
				}
			}
		}
		System.out.println(msg);
	}

}