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: kitchenware 
Words: metal, glass, knifer, dish, cup

Ex Output:
metal


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

Ex Output:
truss rod


Ex Input:
Category: animal 
Words: leap, bus, bird, fish, fly

Ex Output:

bus