Given a set of five words, generate the word from the set that does not belong (i.e. is the least relevant) with the other words. Words are separated by commas.

Ex Input:
mallet, winch, parrot, winch, crane

Ex Output:
winch

Ex Input:
fine, classy, mad, happy, relaxed

Ex Output:
classy

Ex Input:
current, history, late, flow, up to the moment

Ex Output:
flow