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: boxing terminology 
Words: ring, lifeline, deck, punch, corner

Ex Output:
lifeline


Ex Input:
Category: military rank 
Words: regular, major, general, soldier, cadet

Ex Output:
regular


Ex Input:
Category: animals 
Words: duck, sprint, mallet, sheep, goose

Ex Output:

sprint