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: direction 
Words: below, backward, melancholy, down, ground

Ex Output:
melancholy


Ex Input:
Category: temperature 
Words: warm, relaxing, freezing, cool, calm

Ex Output:

calm