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()
if 'keyence' in s:
    print("YES")
elif 'keyenc' in s:
    index = s.find('keyenc')
    index2 = s.find('e',index+5)
    if index2 != -1:
        print("YES")
elif 'keyen' in s:
    index = s.find('keyen')
    index2 = s.find('ce',index+4)
    if index2 != -1:
        print("YES")
elif 'keye' in s:
    index = s.find('keye')
    index2 = s.find('nce',index+3)
    if index2 != -1:
        print("YES")
elif 'key' in s:
    index = s.find('key')
    index2 = s.find('ence',index+4)
    if index2 != -1:
        print("YES")
elif 'ke' in s:
    index = s.find('ke')
    index2 = s.find('yence',index+4)
    if index2 != -1:
        print("YES")
elif 'k' in s:
    index = s.find('k')
    index2 = s.find('eyence',index+4)
    if index2 != -1:
        print("YES")
else:
    print("NO")