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: fax, file, format, image, document

Output: fax


Input: Consider Input: current, history, wave, jetstream, whirlpool

Output: history


Input: Consider Input: custody, prison, probation, fine, neat


Output: neat