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:
ring, deck, pack, box, level

Ex Output:
pack


Ex Input:
trap, kayak, bat, climbing, fish

Ex Output:
bat


Ex Input:
down, emotional supports, forward, emotionalities, kind

Ex Output:

forward