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:
truss rod, emotional supports, emotional upsets, emotionalities, fret

Ex Output:
truss rod


Ex Input:
fine, classy, mad, happy, relaxed

Ex Output:
classy


Ex Input:
cockroach, grasshopper, bus, fly, swim

Ex Output:

bus