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: fire, blaze, water, flame, recruit
Example Output: recruit

Example Input: fax, file, format, image, document
Example Output: fax

Example Input: tart, fudge, truffles, unwarranted, cookies
Example Output:
unwarranted