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: physical property 
Words: fat, area, ugly, capacitance, calcium

Ex Output:
calcium


Ex Input:
Category: physical property 
Words: obese, fat, vitamin c, heavy, thin

Ex Output:
vitamin c


Ex Input:
Category: animal 
Words: fish, hamster, swim, cat, horse

Ex Output:

swim