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: hamburger, club, discothek, lettuce, dagwood
Example Output: discothek

Example Input: angular momentum, fat, calcium, brittleness, ugly
Example Output: calcium

Example Input: fine, there, classy, wispy, detailed
Example Output:
wispy