Given a category and a set of five words, find the word from the set that does not belong (i.e. is the least relevant) with the other words in the category. Words are separated by commas.

Ex Input:
Category: employment activity 
Words: ban, fire, empower, sack, ground

Ex Output:
ground


Ex Input:
Category: animal 
Words: flutter, fly, bats, eagle, pounce

Ex Output:
flutter


Ex Input:
Category: police punishment 
Words: hearing, money, classy, penalty, fine

Ex Output:

classy