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: type of rigidity 
Words: solid, leverage, hard, unbending, firm

Ex Output:
leverage


Ex Input:
Category: shady activities 
Words: banned, replace, smear, chocolate cake, fudge

Ex Output:
chocolate cake


Ex Input:
Category: emotional status 
Words: ashamed, right, sad, down, emotional state

Ex Output:

right