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)

s = input()
ans = "NO"

keyword = "keyence"
for i in range(1, len(keyword)):
    if keyword[:i] in s and keyword[i:] in s:
        s_replaced = s.replace(keyword[:i], "*", 1).replace(keyword[i:], "*", 1)
        splited = s_replaced.split("*")
        while "" in splited:
            splited.remove("")
        if len(splited) <= 1:
            ans = "YES"

print(ans)