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)

var = gets
success = false


index = var.index('k')
if index
if var.index('eyence', index)
  puts 'YES'
  success = true
  exit
end
end


index = var.index('ke')
if index
if var.index('yence', index)
  puts 'YES'
  success = true
  exit
end
end

index = var.index('key')
if index
if var.index('ence', index)
  puts 'YES'
  success = true
  exit
end
end
index = var.index('keye')
if index
if var.index('nce', index)
  puts 'YES'
  success = true
  exit
end
end
index = var.index('keyen')
if index
if var.index('ce', index)
  puts 'YES'
  success = true
  exit
end
end
index = var.index('keyenc')
if index
if var.index('e', index)
  puts 'YES'
  success = true
  exit
end
end
if var.index('keyence')
  puts 'YES'
  success = true
  exit
end

unless success
  puts 'NO'
end