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 (7.4.4) (judge verdict: Accepted)

<?php
list($s) = strs();
$n = strlen($s);
for ($i = 0; $i < $n; ++$i) {
    for ($l = 0; $l <= $n - $i; ++$l) {
        $ss = substr($s, 0, $i) . substr($s, $i + $l);
        if ($ss === 'keyence') exit('YES');
    }
}
echo 'NO';
function strs()
{
    return explode(' ', trim(fgets(STDIN)));
}