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: prime, penalty, fine, mad, arrest

Output: mad


Input: Consider Input: ugly, absorption, vitamin c, fat, thin

Output: vitamin c


Input: Consider Input: fawn, kitten, calf, paw, buck


Output: paw