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: food 
Words: fortitude, meat, cheese, frank, pork
Example Output: fortitude

Example Input: Category: accomodation 
Words: apartment, lined, house, condominium, flat
Example Output: lined

Example Input: Category: aesthetic characteristic 
Words: custody, fine, pretty, beautiful, attractive
Example Output:
custody