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: unflappalbe, refreshing, funny, cool, confident
Example Output: refreshing

Example Input: fine, classy, mad, happy, relaxed
Example Output: classy

Example Input: cow, mice, dolphin, wrestle, fish
Example Output:
wrestle