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: window material 
Words: metal, handle, dish, glass, vinyl

Ex Output:
dish


Ex Input:
Category: aesthetic characteristic 
Words: fair, deal, color, medium, level

Ex Output:

deal