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, vitamin c, area, brittleness, absorption

Ex Output:
vitamin c


Ex Input:
Category: window material 
Words: plastic, woodwork, glass, bowl, spyhole

Ex Output:
bowl


Ex Input:
Category: consumer product 
Words: service, angry, shop, content, thing

Ex Output:

angry