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:
egret, mallet, tackle, davit, crane

Ex Output:
tackle


Ex Input:
truss rod, pick, chord, worried, fret

Ex Output:
worried


Ex Input:
fat, angular momentum, ugly, capacitance, fiber

Ex Output:

fiber