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: fiber, big boned, protein, carbs, fat
Example Output: big boned

Example Input: blue, current, drink, water, prompt
Example Output: prompt

Example Input: cool, ethical, persistent, cold, assured
Example Output:
cold