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: inlays, concerned, string, notes, fret
Example Output: concerned

Example Input: elephant, duck, sprint, dog, lion
Example Output: sprint

Example Input: ashamed, emotional state, ground, shameful, down
Example Output:
ground