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: Runtime Error)

def main(pro):
    ans = 'keyence'
    try:
        lokasi = pro.index(ans)
        if lokasi > 0 and lokasi + len(ans) < len(pro):
            raise ValueError()
            return
        else:
            print('YES')
            return
    except:
        # it is split
        for i in range(len(ans)):
            if ans[i] != pro[i]:
                break
        r = len(ans) - i
        for a in range(1,r+1):
            if ans[-r] != pro[-r]:
                print('NO')
                return
        print('YES')
while True:
    main(input())