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: mode of transportation 
Words: beetle, fly, soar, bus, car

Ex Output:
beetle


Ex Input:
Category: bird 
Words: crane, concrete pourer, goose, hoist, duck

Ex Output:
concrete pourer


Ex Input:
Category: emotional display 
Words: paw, suppressed, cub, love, fawn

Ex Output:

cub