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: direction 
Words: south, loveful, down, left, falling

Ex Output:
loveful


Ex Input:
Category: outdoor sport activity 
Words: kayak, raft, fish, canyoning, dolphin

Ex Output:
dolphin


Ex Input:
Category: bird 
Words: sandpiper, crane, davit, tackle, heron

Ex Output:

davit