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: ocean 
Words: signal, timely, brine, flow, current

Ex Output:
timely


Ex Input:
Category: bird 
Words: ostrich, digger, sandpiper, crane, goose

Ex Output:
digger


Ex Input:
Category: aesthetic characteristic 
Words: tone, fair, milky, decent, even

Ex Output:

decent