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:
deck, board, corner, knockout, fight

Ex Output:
board


Ex Input:
stern, frank, weenie, brash, matter of fact

Ex Output:
weenie


Ex Input:
finished for the day, close, shut, open, on top of

Ex Output:

on top of