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: weather 
Words: raining, sunny, fair, ghostly, windy

Ex Output:
ghostly


Ex Input:
Category: type of rigidity 
Words: rigged, firm, unyielding, streamline, taut

Ex Output:
streamline


Ex Input:
Category: animal 
Words: mice, cat, canyoning, fish, dog

Ex Output:

canyoning