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 PHP7 (7.0.15) (judge verdict: Wrong Answer)

<?php
$S = trim(fgets(STDIN));

if (preg_match("/.*keyence/",$S)
    || preg_match("/k.*eyence/",$S)
    || preg_match("/ke.*yence/",$S)
    || preg_match("/key.*ence/",$S)
    || preg_match("/keye.*nce/",$S)
    || preg_match("/keyen.*ce/",$S)
    || preg_match("/keyenc.*e/",$S)
    || preg_match("/keyence.*/",$S)

){
    echo ("YES") . "\n";
}else{
    echo("NO") . "\n";
}