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: police punishment 
Words: classy, probation, custody, fine, flyaway

Ex Output:
classy


Ex Input:
Category: computers 
Words: hardware, download, file, support, program

Ex Output:
support


Ex Input:
Category: boats 
Words: head, bow, deck, lifeline, apron

Ex Output:

apron