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: outdoor sport activity 
Words: whale, fish, raft, hiking, kayak

Ex Output:
whale


Ex Input:
Category: location (proximity) 
Words: neighboring, right there, shut down, close, bordering

Ex Output:
shut down


Ex Input:
Category: police punishment 
Words: happy, fine, jail time, firstrate, jail

Ex Output:

happy