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: boxing terminology 
Words: caution, hearts, canvas, deck, fight

Ex Output:
hearts


Ex Input:
Category: accomodation 
Words: apartment, cabin, squashed, smooth, flat

Ex Output:
smooth


Ex Input:
Category: emotional status 
Words: relaxed, there, ok, happy, fine

Ex Output:

there