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 Julia (0.5.0) (judge verdict: Runtime Error)

function main()
S = readline()
target = "keyence"
index = 1
cut = 0
state = false
for s in S
  if s == target[index]
    index += 1
    state = true  
  elseif s != target[index] && state == true
    state = false  
  	cut += 1
  end
  if cut > 1
    println("NO")
    return 0
  end  
end
  println("YES")
end
main()