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:
dock, canvas, deck, blocking, caution

Ex Output:
dock


Ex Input:
order office supplies, sort mail, file, program, type

Ex Output:
program


Ex Input:
elephant, duck, sprint, stoop, get down

Ex Output:

elephant