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: running., close, bordering, nearer, touching
Example Output: running.

Example Input: dastards, delayed, current, late, drink
Example Output:
drink