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.

Example Input: finger, heel, foot, ounce, elbow
Example Output: ounce

Example Input: hardware, firewall, file, format, order office supplies
Example Output: order office supplies

Example Input: lettuce, grilled cheese, open-faced, clan, club
Example Output:
clan