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:
tko, ring, corner, hearts, deck

Ex Output:
hearts


Ex Input:
goodies, fortitude, frank, pork, weenie

Ex Output:
fortitude


Ex Input:
common, inflexible, llc, firm, sustainability

Ex Output:

inflexible