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: finger, heel, foot, ounce, elbow
Example Output: ounce

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

Example Input: jab, level, fold, blocking, deck
Example Output:
fold