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'
pattern = 'keyence'

if pattern in s:
    ans = 'YES'

for i in range(1, len(pattern) - 1):
    x = pattern[:i]
    y = pattern[i:]
    p = 0
    while s.find(x, p) >= 0:
        p = s.find(x, p) + len(x)
        if s.find(y, p) >= 0:
            ans = 'YES'
            break

print(ans)