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 = gets.chomp
array = s.split("")
str = "keyence"
answer = "NO"
if s[0,7] == str
  answer = "YES"
end
if s[-7,7] == str
  answer = "YES"
end

for i in (0..5)
  if s[i] ==  str[i]
    if s[-(6-i),(6-i)] == str[i+1,6-i]
    answer ="YES"
  end
end
end
puts answer