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.

Input: Consider Input: spring, run, fall, equinox, autumn

Output: run

Input: Consider Input: goodies, fortitude, frank, pork, weenie

Output: fortitude

Input: Consider Input: foot, kilometer, milimeter, pound, elbow
Output: elbow