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: swallow, heron, crane, flamingo, tackle
Example Output: tackle

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

Example Input: falsehood, fudge, cookies, truffles, tart
Example Output:
falsehood