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)

s = STDIN.gets.chomp

if s.match(/\A.+keyence\z/)
  puts 'YES'
elsif s.match(/\Ak.+eyence\z/)
  puts 'YES'
elsif s.match(/\Ake.+yence\z/)
  puts 'YES'
elsif s.match(/\Akey.+ence\z/)
  puts 'YES'
elsif s.match(/\Akeye.+nce\z/)
  puts 'YES'
elsif s.match(/\Akeyen.+ce\z/)
  puts 'YES'
elsif s.match(/\Akeyenc.+e\z/)
  puts 'YES'
elsif s.match(/\Akeyence.+\z/)
  puts 'YES'
elsif s == 'keyence'
  puts 'YES'
else
  puts 'NO'
end