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: social gathering 
Words: group, clan, team, club, doorstep

Ex Output:
doorstep


Ex Input:
Category: type of sandwich 
Words: clan, lettuce, bacon, club, submarine

Ex Output:
clan


Ex Input:
Category: physical property 
Words: capacitance, absorption, calcium, pasty, fat

Ex Output:

calcium