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.

Example Input: truss rod, pick, chord, worried, fret
Example Output: worried

Example Input: ok, mad, fine, bright, annoyed
Example Output: bright

Example Input: box, crew, galley, deck, bridge
Example Output:
box

