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: deck, stern, apron, blocking, caution

Output: stern


Input: Consider Input: tackle, davit, swift, crane, steam roller

Output: steam roller


Input: Consider Input: air, fire, hire, ban, promote


Output: air