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)


import sys
#sys.stdin=open("data.txt")
input=sys.stdin.readline
mii=lambda:map(int,input().split())

s=input().strip()

yes=0
for i in range(7):
    if s[:i]+s[-7+i:]=="keyence":
        yes=1
    #print(i,s[:i]+s[-7+i:])
if s[:7]=="keyence":    # this case is not considered in the loop
    yes=1

print("YES" if yes else "NO")