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: Wrong Answer)

a = gets.to_s

b = a.match(/^keyence\w+/)
c = a.match(/^\w+keyence$/)
d = a.match(/^k\w+eyence$/)
e = a.match(/^ke\w+yence$/)
f = a.match(/^key\w+ence$/)
g = a.match(/^keye\w+nce$/)
h = a.match(/^keyen\w+ce$/)
i = a.match(/^keyenc\w+e$/)

case when b,c,d,e,f,g,h,i
 puts "YES"
else
 puts "NO"
end