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: up to the moment, current, detests, tide, history
Example Output: tide

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

Example Input: sack, cool, replace, praise, fire
Example Output:
cool