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: activity 
Words: spend, divide, apple, whittle, fritter

Ex Output:
apple


Ex Input:
Category: baby animals 
Words: buck, bambi, lust, fawn, deer

Ex Output:
lust


Ex Input:
Category: social gathering 
Words: bacon, club, discothek, group, convention

Ex Output:

bacon