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: Accepted)

a = 'keyence'
s = input()
S = len(s)
if s[:7] == 'keyence':
    print('YES')
elif s[:6] == 'keyenc' and s[-1] == 'e':
    print('YES')
elif s[:5] == 'keyen' and s[-2:] == 'ce':
    print('YES')
elif s[:4] == 'keye' and s[-3:] == 'nce':
    print('YES')
elif s[:3] == 'key' and s[-4:] == 'ence':
    print('YES')
elif s[:2] == 'ke' and s[-5:] == 'yence':
    print('YES')
elif s[0] == 'k' and s[-6:] == 'eyence':
    print('YES')
elif s[-7:] == 'keyence':
    print('YES')
else:
    print('NO')