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: big boned, vitamin c, fiber, sugar, fat
Example Output: big boned

Example Input: brownie, fudge, wrongful, mangle, loosen
Example Output: brownie

Example Input: bow, duck, lion, get down, stoop
Example Output:
lion