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: hire, flame, pay, fire, ban

Output: flame

Input: Consider Input: frank, bold, brash, precise, pork

Output: pork

Input: Consider Input: ethical, tropical, unflappalbe, cool, optimist
Output: tropical