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)

import re
S = input()

result = ''
for v in S:
    if result == '' and v == 'k':
        result += 'k'
    if result == 'k' and v == 'e':
        result += 'e'
    if result == 'ke' and v == 'y':
        result += 'y'
    if result == 'key' and v == 'e':
        result += 'e'
    if result == 'keye' and v == 'n':
        result += 'n'
    if result == 'keyen' and v == 'c':
        result += 'c'
    if result == 'keyenc' and v == 'e':
        result += 'e'
if result == 'keyence':
    print('YES')
else:
    print('NO')