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.

Input: Consider Input: Category: social gathering 
Words: place, bar, doorstep, club, outing

Output: doorstep


Input: Consider Input: Category: bird 
Words: crane, concrete pourer, goose, hoist, duck

Output: concrete pourer


Input: Consider Input: Category: police punishment 
Words: prison, mad, arrest, fine, wispy


Output: mad