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:
crying, truss rod, angry, emotional supports, fret

Ex Output:
truss rod


Ex Input:
kind, down, sad, backward, emotionalities

Ex Output:
backward


Ex Input:
fine, jail, arrest, firstrate, pretty

Ex Output:

pretty