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: measurement unit 
Words: meter, inch, foot, heel, pound

Ex Output:
heel


Ex Input:
Category: accomodation 
Words: even, townhome, level, flat, paved

Ex Output:
level


Ex Input:
Category: police punishment 
Words: ticket, beautiful, fine, flyaway, hearing

Ex Output:

beautiful