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: down, kind, opposite of up, lower, ground
Example Output: kind

Example Input: misuse, danish, fritter, dally, whittle
Example Output: danish

Example Input: ice, earth, instruct, heat, fire
Example Output:
instruct