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: aesthetic characteristic 
Words: level, fair, milky, sunny, well

Ex Output:
sunny


Ex Input:
Category: animal 
Words: fly, run, drive, ant, cockroach

Ex Output:

drive