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: fair, raining, equitable, impartial, unjust
Example Output: raining

Example Input: current, wave, whirlpool, sea, data sets
Example Output: data sets

Example Input: club, group, meeting, grilled cheese, convention
Example Output:
grilled cheese