Given a category and a set of five words, find the word from the set that does not belong (i.e. is the least relevant) with the other words in the category. Words are separated by commas.

Ex Input:
Category: emotional status 
Words: fret, truss rod, emotional upsets, sad, worried

Ex Output:
truss rod


Ex Input:
Category: employment activity 
Words: sack, inferno, promote, empower, fire

Ex Output:
inferno


Ex Input:
Category: kitchenware 
Words: knifer, knive, glass, woodwork, knife

Ex Output:

woodwork