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: fearful, content, substance, program, thing
Example Output: fearful

Example Input: jog, waggle, pounce, fly, bats
Example Output: jog

Example Input: fawn, identity, hatchling, social, cute
Example Output:
hatchling