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: dumpling, fritter, goodbye, pastry, skin
Example Output: goodbye

Example Input: glass, wood, coating, knifer, woodwork
Example Output: knifer

Example Input: fire, air, earth, instruct, blaze
Example Output:
instruct