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.

Input: Consider Input: apartment, round, valley, flat, even

Output: valley


Input: Consider Input: hull, galley, deck, lifeline, tko

Output: tko


Input: Consider Input: get down, sheep, duck, cat, goose


Output: get down