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: hull, galley, deck, lifeline, tko
Example Output: tko

Example Input: goodies, fortitude, frank, pork, weenie
Example Output: fortitude

Example Input: program, firewall, reception, file, space
Example Output:
reception