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()
finalcheck = 0
moji = 'keyence'
for i in range(1,8):
    check = 0
    for j in range(len(s)-i+1):
        if moji[:i] == s[j:j+i]:
            check = j+i
            if i == 7:
                if len(s[:j]) == 0 or len(s[j+i:]) == 0: finalcheck = 1
            break
    if check != 0:
        for j in range(check,len(s)-i+1):
            if moji[i:] == s[j:j+len(s)-i]:
                finalcheck = 1
                break
    if finalcheck == 1:break
if finalcheck:print('YES')
else:print('NO')