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: air, fire, hire, ban, promote

Output: air

Input: Consider Input: ostrich, hoist, egret, crane, parrot

Output: hoist

Input: Consider Input: level, deck, gunwale, galley, rudder
Output: level