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: ocean 
Words: current, wave, whirlpool, sea, data sets

Ex Output:
data sets


Ex Input:
Category: aesthetic characteristic 
Words: luke, fair, variety, tone, well

Ex Output:
luke


Ex Input:
Category: social gathering 
Words: club, burger, dance hall, cinema, bar

Ex Output:

burger