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 Scala (2.11.7) (judge verdict: Accepted)

object Main extends App {
  val in = scala.io.Source.stdin.getLines.toSeq
  val in2 = in.head
  //println(in2)
  
  val k = "keyence"
  
  private def func(s: String):Boolean = {
    if(s.startsWith(k) || s.endsWith(k)) return true
    if(k == s.take(1) + s.takeRight(6)) return true
    if(k == s.take(2) + s.takeRight(5)) return true
    if(k == s.take(3) + s.takeRight(4)) return true
    if(k == s.take(4) + s.takeRight(3)) return true
    if(k == s.take(5) + s.takeRight(2)) return true
    if(k == s.take(6) + s.takeRight(1)) return true
  	false
  }
  val ret = if(func(in2)) "YES" else "NO"
  println(ret)
}