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:
emotional upsets, emotional supports, down, ashamed, up

Ex Output:
up


Ex Input:
format, sort mail, make coffee, order office supplies, file

Ex Output:
format


Ex Input:
call, board, hearts, deck, hull

Ex Output:

hull