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)

kstr = input()
klist = list(kstr)
klength = len(kstr)
ansstr = ["k","e","y","e","n","c","e"]
if klist[0:7] == ansstr :
  print("YES")
else:
  if (klist[0:6]+klist[klength-1:klength]) == ansstr :
    print("YES")
  else:
    if (klist[0:5]+klist[klength-2:klength]) == ansstr :
      print("YES")
    else:
      if (klist[0:4]+klist[klength-3:klength])== ansstr:
        print("YES")
      else:
        if (klist[0:3]+klist[klength-4:klength])== ansstr:
          print("YES")
        else:
          if (klist[0:2]+klist[klength-5:klength])== ansstr:
            print("YES")
          else:
            if (klist[0:1]+klist[klength-6:klength])== ansstr:
              print("YES")
            else:
              if (klist[klength-7:klength])== ansstr:
                print("YES")
              else:
                print("NO")