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:
upraise, crane, excavator, digger, hoist

Ex Output:
hoist


Ex Input:
forward, backward, sad, down, sliding

Ex Output:

sad