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: moral characteristic 
Words: frank, concise, bun, matter of fact, fortitude

Ex Output:
bun


Ex Input:
Category: location (proximity) 
Words: near, close, gated, bordering, on top of

Ex Output:
gated


Ex Input:
Category: body part 
Words: eye, knee, foot, heel, pound

Ex Output:

pound