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: file, keys, document, fax, ram
Example Output: fax

Example Input: organize, support, text, sort mail, file
Example Output: text

Example Input: variety, well, fair, medium, endure
Example Output:
endure