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: streamline, sustainability, private, firm, stiff
Example Output: stiff

Example Input: crying, concerned, pick, emotionalities, fret
Example Output: pick

Example Input: fair, stormy, raining, balanced, endure
Example Output:
balanced