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)

k = input()
n = 'keyence'
z = 0
for i in range(len(k)):
    if k[i] == 'k':
        for j in range(len(n)):
            if k[i+j] != n[j]:
                z += 1
                for p in range(i+j, len(k)):
                    
                    if n[j:] in k[p:]:
                        break
                    else:
                        z += 1
                        break
            
            break
    else:
        z = 2
    break

if z == 0 or z == 1:
    print('YES')
else:
    print('NO')