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 Ruby (2.3.3) (judge verdict: Accepted)

require 'pp'

# 入力値を文字列で返却する
def gets_s()
  gets.chomp
end

S = gets_s

keys = [
  ["", "keyence"],
  ["k", "eyence"],
  ["ke", "yence"],
  ["key", "ence"],
  ["keye", "nce"],
  ["keyen", "ce"],
  ["keyenc", "e"],
  ["keyence", ""],
]

keys.each do |left, right|
  if S.index(left) == 0 && S.reverse.index(right.reverse) == 0
    puts "YES"
    exit
  end
end
puts "NO"