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: physical property 
Words: large, obese, fat, chunky, fiber

Ex Output:
fiber


Ex Input:
Category: type of sandwich 
Words: submarine, group, club, roll, grilled cheese

Ex Output:
group


Ex Input:
Category: mode of transportation 
Words: bus, fly, ant, drive, glide

Ex Output:

ant