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: variety, fine, fair, ok, balanced

Ex Output:
variety


Ex Input:
Category: elements 
Words: ice, fire, burn, let go, combustion

Ex Output:
let go


Ex Input:
Category: animal 
Words: bird, ant, bus, fly, beetle

Ex Output:

bus