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: weather 
Words: impartial, 70, warm, fair, luke
Example Output: impartial

Example Input: Category: geographical property 
Words: flat, horizontal, smooshed, elevation, house
Example Output: house

Example Input: Category: food 
Words: brash, frank, bun, hot dog, grub
Example Output:
brash