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.

Ex Input:
Category: type of sandwich
Words: grilled cheese, french toast, outing, burger, club

Ex Output:
outing

Ex Input:
Category: consumer product
Words: joyful, program, activity, food, content

Ex Output:
joyful

Ex Input:
Category: corporate
Words: synergy, sustainability, hard, alignment, firm

Ex Output:
hard