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: body part 
Words: inch, head, foot, ear, finger

Ex Output:
inch


Ex Input:
Category: police punishment 
Words: fine, prime, firstrate, comfortable, ticket

Ex Output:
comfortable


Ex Input:
Category: body part 
Words: hand, foot, shin, arm, milimeter

Ex Output:

milimeter