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: outdoor sport activity 
Words: kayak, raft, fish, canyoning, dolphin

Ex Output:
dolphin


Ex Input:
Category: animal 
Words: fish, bat, sea turtle, trap, goat

Ex Output:
trap


Ex Input:
Category: animal 
Words: waggle, wave, fly, run, fish

Ex Output:

wave