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:
bow, fold, hull, deck, head

Ex Output:
fold


Ex Input:
cards, deck, suits, box, fold

Ex Output:
box


Ex Input:
bee, grasshopper, walk, fly, waggle

Ex Output:

walk