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: type of sandwich 
Words: grilled cheese, french toast, outing, burger, club
Example Output: outing

Example Input: Category: guitar part 
Words: bored, fret, inlays, string, jack
Example Output:
bored