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, sugar, ugly, chunky, angular momentum
Example Output: sugar

Example Input: emotional state, opposite of up, unhappy, down, miserable
Example Output: opposite of up

Example Input: hiking, wrestle, fish, swim, sea turtle
Example Output:
sea turtle