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: danish, fried, lollygag, pastry, fritter
Example Output: lollygag

Example Input: hummingbird, tackle, crane, hoist, tackle
Example Output:
tackle