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: Accepted)

wlist=[ i for i in input()]
klist=["k","e","y","e","n","c","e"]
a=[]
for i in range(len(wlist)-1):
    for j in range(i+1,len(wlist)):
        if wlist[0:i+1]+wlist[j:]==klist:
                a.append(1)
        else:
                a.append(0)
                
if 1 in a:
    print("YES")
else:
    print("NO")