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: physical activity 
Words: trip, jump, fall, equinox, exercise

Ex Output:
equinox


Ex Input:
Category: aesthetic characteristic 
Words: size, alright, even, variety, fair

Ex Output:
alright


Ex Input:
Category: consumer product 
Words: content, activity, books, file, sad

Ex Output:

sad