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: chocolate food 
Words: cake, fudge, rich, invent, cream

Ex Output:
invent


Ex Input:
Category: consumer product 
Words: fearful, content, merchandise, shop, program

Ex Output:
fearful


Ex Input:
Category: ocean 
Words: course, main, current, whirlpool, timely

Ex Output:

timely