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:
duck, cat, stoop, swan, goose

Ex Output:
stoop


Ex Input:
data sets, sea, prompt, timely, current

Ex Output:
sea


Ex Input:
crane, mallet, goose, dump truck, flamingo

Ex Output:

dump truck