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: hull, galley, deck, lifeline, tko

Output: tko


Input: Consider Input: fret, notes, emotional state, bored, emotional upsets

Output: notes


Input: Consider Input: parrot, crane, derrick, goose, steam roller


Output: steam roller