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: animal 
Words: ant, walk, bike, fly, dangle

Ex Output:
bike


Ex Input:
Category: moral characteristic 
Words: mild, equitable, unprejudiced, trustworthy, fair

Ex Output:
mild


Ex Input:
Category: physical activity 
Words: fall, trip, roll, autumn, drop

Ex Output:

autumn