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:
current, wave, whirlpool, sea, data sets

Ex Output:
data sets


Ex Input:
leverage, solid, firm, amalgamated, concerted

Ex Output:
solid


Ex Input:
suits, pack, queen, dock, deck

Ex Output:

dock