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:
social, love, fawn, follow, kid

Ex Output:
kid


Ex Input:
deck, knockout, bow, sail, rudder

Ex Output:
knockout


Ex Input:
hummingbird, hoist, crane, digger, swallow

Ex Output:

digger