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()

a = [("k", "eyence"), ("ke", "yence"), ("key", "ence"), ("keye", "nce"), ("keyen", "ce"), ("keyenc", "e")]

flg = 0
for i, j in a:
    if s == "keyence":
        flg = 1
        break
    
    s = s.replace(i, "%")
    s = s.replace(j, "&")
    
    if "%" not in s:
        pass
    elif "&" not in s:
        pass
    elif s.index("%") < s.index("&"):
        pass
    else:
        flg = 1
        break
        
if flg == 1:
    print("YES")
else:
    print("NO")