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:
hull, galley, deck, lifeline, tko

Ex Output:
tko


Ex Input:
fair, make the grade, trustworthy, alright, just

Ex Output:
make the grade


Ex Input:
pig, hike, duck, ostrich, cat

Ex Output:

hike