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.

Example Input: Category: employment activity 
Words: recruit, replace, sack, heat, fire
Example Output: heat

Example Input: Category: weather 
Words: sunny, loyal, tangle, fair, raining
Example Output: loyal

Example Input: Category: poker 
Words: draw, corner, deck, pack, board
Example Output:
corner