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

Example Input: mallet, goose, geese, hike, duck
Example Output: hike

Example Input: smooth, flat, level, plain, level
Example Output:
level