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:
elephant, duck, sprint, dog, lion

Ex Output:
sprint


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

Ex Output:
winch


Ex Input:
fly, waggle, wave, dangle, run

Ex Output:

wave