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: ecstatic, specialty, substance, content, merchandise
Example Output: ecstatic

Example Input: condominium, smooshed, lined, smooth, flat
Example Output: condominium

Example Input: rigged, corporation, firm, ceo, alignment
Example Output:
rigged