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: fire, blaze, water, flame, recruit
Example Output: recruit

Example Input: fat, ugly, sugar, salt, protein
Example Output: ugly

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