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 (3.8.2) (judge verdict: Wrong Answer)

s = input()
key = "keyence"
ptr = 0
cnt = 0
f = True
if s == key:
    print("YES")
    exit()

for i in range(len(s)):
    if ptr != 7 and s[i] == key[ptr]:
        f = True
        ptr += 1
    else:
        if f:
            cnt += 1
        f = False


print("YES" if ptr == 7 and cnt <= 1 else "NO")