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.Scanner;
public class Main{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		String a = sc.next();
		String e ="keyence";
		if(a.substring(a.length()-7,a.length())==e){
			System.out.println("YES");
			return;
		}
		for(int i = 1; i <= 7; i++){
				if((a.substring(0,i)).equals(e.substring(0,i))){
						if((a.substring(a.length()-i-1,a.length())).equals(a.substring(a.length()-i-1,a.length()))){
							System.out.println("YES");
							return;
						}
				}
		}
		System.out.println("NO");
	}
}