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 (2.7.1) (judge verdict: Accepted)

#a, b = gets.split.map(&:to_i)
s = gets.chomp
n = s.size

for l in 0..n-1
    for r in l..n
        t = ''
        t += s[0..l-1] if l-1 >= 0
        t += s[r..-1] if r <= n-1
        #p t
        if  t == 'keyence'
            puts 'YES'
            exit
        end
    end
end

puts 'NO'