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: Runtime Error)

import java.util.*;

public class Main {
	Scanner sc = new Scanner(System.in);

	void doIt() {
		String key = "keyence"; 
		char keyset[] = key.toCharArray();
		String s = sc.nextLine();
		int i = 0, ii = 0;
		while(i < key.length()) {
			if(s.charAt(ii) != keyset[i]) {
				ii += s.length() - key.length();
				if(ii > s.length()) {
					System.out.println("NO");
					return;
				}
			}
			i++;
			ii++;
		}
		System.out.println("YES");
	}


	public static void main(String[] args) {
		new Main().doIt();
	}
}