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: shareholders, alignment, firm, sustainability, solid
Example Output: solid

Example Input: protein, chunky, big boned, fat, capacitance
Example Output: protein

Example Input: lettuce, hamburger, place, open-faced, club
Example Output:
place