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: guitar part 
Words: neck, strap lock, fret, angry, notes

Ex Output:
angry


Ex Input:
Category: bird 
Words: crane, concrete pourer, goose, hoist, duck

Ex Output:
concrete pourer


Ex Input:
Category: personal characteristic 
Words: relaxed, icy, cool, unruffled, ethical

Ex Output:

icy