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: animal 
Words: shark, dolphin, fish, hunting, cat

Ex Output:
hunting


Ex Input:
Category: social gathering 
Words: club, bar, dance hall, discothek, roll

Ex Output:
roll


Ex Input:
Category: emotional status 
Words: melancholy, opposite of up, down, shameful, loveful

Ex Output:

opposite of up