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: current, flow, history, signal, jetstream
Example Output: history

Example Input: fret, nervous, board, fingerpick, jack
Example Output: nervous

Example Input: open-faced, hamburger, club, bacon, community
Example Output:
community