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: social gathering 
Words: picnic, french toast, clan, club, bar
Example Output: french toast

Example Input: Category: shady activities 
Words: invent, smuggled, smear, fudge, pie
Example Output: pie

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