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:
bike, flap, fly, walk, wave

Ex Output:
walk


Ex Input:
fine, detached, decent, well, beautiful

Ex Output:
beautiful


Ex Input:
corner, head, deck, dock, bow

Ex Output:

corner