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

Example Input: blocking, crew, jab, deck, glove
Example Output: crew

Example Input: spider, run, waggle, fly, bike
Example Output:
bike