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
org_str = input()
#pattern = r"[^k]*?k[^e]*?e[^y]*?y[^e]*?e[^n]*?n[^c]*?c[^e]*?e[^e]*?"
pattern = r"[a-z]*?k[a-z]*?e[a-z]*?y[a-z]*?e[a-z]*?n[a-z]*?c[a-z]*?e[a-z]*?"

matchOB = re.match(pattern , org_str)
if matchOB:
  print('YES')
else:
  print('NO')