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)

xs = 'keyence'.split('')
c = 0
ARGF.each { |l|
  if l =~ /^keyence$/ or l =~ /^k.*eyence$/ or l =~ /^ke.*yence$/ or l =~ /^key.*ence$/ or l =~ /^keye.*nce$/ or l =~ /^keyen.*ce$/ or l =~ /^keyenc.*e$/ or l =~ /^keyence.*$/
    puts 'YES'
    exit
  end
}
puts 'NO'