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: fine, prime, firstrate, custody, ok

Output: ok


Input: Consider Input: motherboard, folder, hardware, file, schedule appointments

Output: schedule appointments


Input: Consider Input: sprint, duck, sheep, mallet, cow


Output: sprint