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: crane, goose, hoist, pelican, hummingbird
Example Output: hoist

Example Input: unwarranted, fudge, pudding, lie, unlicensed
Example Output: pudding

Example Input: kitten, expression, kid, buck, fawn
Example Output:
expression