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: corporate 
Words: unyielding, firm, streamline, llc, private

Ex Output:
unyielding


Ex Input:
Category: secretary duty 
Words: organize, sort mail, fax, file, text

Ex Output:
text


Ex Input:
Category: window material 
Words: wood, cup, glass, spyhole, fiberglass

Ex Output:

cup