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 scn =  new Scanner(System.in);
		String str = scn.nextLine();
		String key = "keyence";
		String buf,buf2;
		boolean ans = false;
		for(int i = 0;i <= 7;i++) {
			buf = str.substring(0, i);
			if(buf.equals(key.substring(0, i))) {
			}else {
				key = key.substring(i);
				break;
			}
			if(i == 7)
			ans = true;
		}
		ans |= key.equals(str.substring(str.length() - key.length()));
		System.out.println(ans?"YES":"NO");
	}
}