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: boats 
Words: head, hull, knockout, deck, dock

Ex Output:
knockout


Ex Input:
Category: physical activity 
Words: trip, jump, fall, equinox, exercise

Ex Output:
equinox


Ex Input:
Category: body part 
Words: finger, ankle, shin, foot, yard

Ex Output:

yard