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, duck, sheep, goose, geese

Ex Output:
bow


Ex Input:
ubiquitous, general, basic, major, popular

Ex Output:
major


Ex Input:
iguana, kayak, canoe, trap, fish

Ex Output:

iguana