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: lower, backward, down, falling, shameful

Output: shameful


Input: Consider Input: fret, notes, emotional state, bored, emotional upsets

Output: notes


Input: Consider Input: ice, air, fire, hire, combustion


Output: hire