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:
board, caution, fight, punch, deck

Ex Output:
board


Ex Input:
fritter, fried, cake, patty, seperate

Ex Output:
seperate


Ex Input:
close, on top of, bordering, neighboring, shut

Ex Output:

shut