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

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

Example Input: expression, fawn, hatchling, calf, deer
Example Output:
expression