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){
    	Scanner sc = new Scanner(System.in);
		String K = "keyence";
		String S = sc.next();
        boolean fl = false;
        int l = S.length();
      	
      	for(int i=6;0<=i;i--){
        	if(S.substring(0,i)== K.substring(0,i)){
        		if(S.substring(l-(6-i))==K.substring(i)){
                	System.out.println("YES");
                    fl = true;
                  	break;
                }
            }
        
        }
      	if(!fl){
          System.out.println("NO");
        }
     } 
}