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:
mild, cold, level, stormy, fair

Ex Output:
level


Ex Input:
heron, davit, egret, derrick, crane

Ex Output:
davit


Ex Input:
deck, fight, crew, bridge, galley

Ex Output:

fight