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: bird 
Words: ostrich, digger, sandpiper, crane, goose

Output: digger


Input: Consider Input: Category: boats 
Words: check, stern, hull, galley, deck

Output: check


Input: Consider Input: Category: season 
Words: summer, autumn, fall, stoop, winter


Output: stoop