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)

i_str = gets.chomp.to_s
if i_str == "keyence"
  puts "YES"
elsif i_str.length == 7
  puts "NO"
else
  e = i_str.length - 1
  len = i_str.length - 7
  ans = i_str.split("").map(&:to_s)
  if ans[len..e].join == "keyence" || ans[0..6].join == "keyence"
    puts "YES"
  else
    check = false
    7.times do |i|
      str = ans[0..i].join + ans[(i+len+1)..e].join
      if str == "keyence"
        check = true
        break
      end
    end
    if check
      puts "YES"
    else
      puts "NO"
    end
  end
end