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 Perl (v5.18.2) (judge verdict: Accepted)

$s=<>;
$t=keyence;
foreach(0..7){
    $p=substr($t,0,7-$_);
    $q=substr($t,7-$_,$_);
    if($s=~/^\Q$p\E.*\Q$q\E$/){
        print"YES";
        exit;
    }
}
print"NO"