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()
t = "keyence"
p = 0
for i in range(len(s)):
    if p == 0:
        if i <= 6:
            if s[i] != t[i]:
                k = i
                p = 1
    elif p == 1:
        if s[i] == t[k]:
            j = i
            p = 2
        if i == len(s) - 1:
            print("No")
            exit()
    elif p == 2:
        if k + i - j <= 6:
            if s[i] != t[k + i - j]:
                print("No")
                exit()
        else:
            print("No")
            exit()
print("Yes")