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: consumer product 
Words: merchandise, happy, thing, content, service

Ex Output:
happy


Ex Input:
Category: animal 
Words: hamster, mice, fish, tiger, row

Ex Output:
row


Ex Input:
Category: date status 
Words: late, up to the moment, current, course, belated

Ex Output:

course