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 PHP (5.6.30) (judge verdict: Accepted)

<?php
$x = str_split(trim(fgets(STDIN)));
$l = count($x);
for($i = 0;$i<8;$i++){
$a=$x;
$b =array_splice($a,$i,$l-7);
$imp = implode($a);
if($imp == 'keyence'){
echo 'YES';
exit;

}
}
echo 'NO';