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: Runtime Error)

s=input()
n=len(s)
k=list('keyence')
ans='NO'
cnt=[0]*n
final=0
j=0
for i in range(n):
    if s[i]==k[j]:
        cnt[i]=1
        j+=1
for i in range(n-1):
    if cnt[i]!=cnt[i+1]:
        final+=1
if cnt[0]==0 and final==1:
    ans='YES'
elif cnt[0]==1 and final==2:
    ans='YES'
if n==7 and final==0:
    ans='YES'
print(ans)