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:
bow, fold, hull, deck, head

Ex Output:
fold


Ex Input:
shareholders, alignment, firm, sustainability, solid

Ex Output:
solid


Ex Input:
ticket, flyaway, classy, suspension, fine

Ex Output:

classy