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

Example Input: run, bats, fly, flutter, spider
Example Output: flutter

Example Input: content, ecstatic, thing, shop, merchandise
Example Output:
ecstatic