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: ubiquitous, general, basic, major, popular
Example Output: major

Example Input: fret, angry, jack, nervous, emotionalities
Example Output: jack

Example Input: crane, steam roller, digger, hoist, mallet
Example Output:
mallet