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: grilled cheese, french toast, outing, burger, club

Ex Output:
outing


Ex Input:
Category: police punishment 
Words: flyaway, jail time, ok, arrest, fine

Ex Output:
ok


Ex Input:
Category: ocean 
Words: history, brine, tide, water, current

Ex Output:

history