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 Python (3.4.3) (judge verdict: Wrong Answer)

import re

s = input()
key = 'keyence'
x = 0

str0 = re.compile(r'^' + key)
str1 = re.compile(r'' + key + '$')

if str0.search(s) != None or str1.search(s) != None:
  x = 1
else:
  for i in range(7):
    if x == 1:
      break
    str0 = re.compile(r'^' + key[i:])
    str1 = re.compile(r'' + key[-(6-i):] + '$')
    if str0.search(s) != None and str1.search(s) != None:
      x = 1

if x == 1:
  print('YES')
else:
  print('NO')