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: emotional status 
Words: ecstatic, excited, content, activity, angry

Ex Output:
activity


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

Ex Output:
alright


Ex Input:
Category: geographical property 
Words: smooth, flat, level, plain, level

Ex Output:

level