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:
foot, knee, eye, leg, ounce

Ex Output:
ounce


Ex Input:
deck, stern, apron, blocking, caution

Ex Output:
stern


Ex Input:
data sets, flow, current, delayed, detests

Ex Output:

flow