Given a set of five words, generate the word from the set that does not belong (i.e. is the least relevant) with the other words. Words are separated by commas.

Example Input: cake, fudge, rich, invent, cream
Example Output: invent

Example Input: knockout, blocking, crew, tko, deck
Example Output: crew

Example Input: winch, swallow, winch, crane, parrot
Example Output:
winch