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: police punishment 
Words: wispy, fine, probation, calm, prime

Ex Output:
calm


Ex Input:
Category: animal 
Words: soar, cockroach, walk, fly, run

Ex Output:
soar


Ex Input:
Category: corporate 
Words: streamline, sustainability, private, firm, stiff

Ex Output:

stiff