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()
s = "keyence"
flag = False
ans = "NO"
for i in range(len(S)):
  if s[:i] in S:
    s1 = s[:i]
    s2 = s[i:]
    flag = True
    
if flag:
  for i in range(len(S)-len(s1)):
    if s1 == S[i:i+len(s1)]:
      if s2 in S[i+len(s1):]:
        ans = "YES"
        break

print(ans)