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:
hoist, sandpiper, crane, swallow, heron

Ex Output:
hoist


Ex Input:
ashamed, down, emotional upsets, disgusted, ground

Ex Output:
ground


Ex Input:
cup, vinyl, panel, glass, coating

Ex Output:

cup