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: elements
Words: ice, air, fire, hire, combustion
Example Output: hire

Example Input: Category: computers
Words: download, file, order office supplies, document, motherboard
Example Output: order office supplies

Example Input: Category: nutritional value
Words: fat, ugly, sugar, salt, protein
Example Output:
ugly