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: type of sandwich 
Words: club, open-faced, convention, doorstep, roll

Ex Output:
convention


Ex Input:
Category: animal 
Words: goat, cat, fish, hamster, hunting

Ex Output:
hunting


Ex Input:
Category: employment activity 
Words: instruct, remove, let go, fire, water

Ex Output:

water