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:
pack, hearts, deck, queen, rudder

Ex Output:
rudder


Ex Input:
prime, penalty, fine, mad, arrest

Ex Output:
mad


Ex Input:
big, absorption, calcium, fat, fiber

Ex Output:

absorption