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: rudder, bow, pack, crew, deck

Output: pack

Input: Consider Input: fire, blaze, water, flame, recruit

Output: recruit

Input: Consider Input: spider, wave, fly, swim, flap
Output: spider