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: type of sandwich 
Words: hoagie, burger, hamburger, club, discothek

Ex Output:
discothek


Ex Input:
Category: animal 
Words: cockroach, leap, drive, swim, fly

Ex Output:
drive


Ex Input:
Category: bird 
Words: goose, egret, flamingo, crane, tackle

Ex Output:

tackle