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, sad, amp, fingerpick, string
Example Output: sad

Example Input: invent, unlicensed, brownies, lie, fudge
Example Output: brownies

Example Input: cajole, hatchling, lust, social, fawn
Example Output:
hatchling