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: fat, obese, iron, sugar, sugars
Example Output: obese

Example Input: apartment, round, valley, flat, even
Example Output: valley

Example Input: jack, notes, angry, fret, headstock
Example Output:
angry