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: leverage, solid, firm, amalgamated, concerted

Ex Output:
solid


Ex Input:
Category: computers 
Words: hardware, sort mail, download, program, file

Ex Output:
sort mail


Ex Input:
Category: police punishment 
Words: ticket, hearing, firstrate, fine, classy

Ex Output:

classy