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: fat, ugly, sugar, salt, protein
Example Output: ugly

Example Input: variety, medium, endure, size, fair
Example Output: endure

Example Input: ground, down, emotionalities, melancholy, loveful
Example Output:
ground