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: jog, car, bike, bats, fly
Example Output: bats

Example Input: notes, fingerpick, neck, fret, emotional upsets
Example Output:
emotional upsets