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: Wrong Answer)

s = gets.chomp
array = s.split('')
answer= "keyence".split('')
count = 0
shit,out,gameover= false,false,false
a = "NO"
array.each do |i|
  if i == answer[count]
    count+=1
    if shit
      out =true
    end
  else
    shit = true
      if out 
        gameover = true
        break
      end
  end
end
if gameover != true && count == 7
  puts "YES"
else
 puts a
end