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: apartment, round, valley, flat, even
Example Output: valley

Example Input: order office supplies, file, errands, prepare, motherboard
Example Output: motherboard

Example Input: sausage, bold, frank, cheese, grub
Example Output:
bold