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: forward, opposite of up, unhappy, downward, down
Example Output: unhappy

Example Input: gated, right there, not open, barred, close
Example Output: right there

Example Input: kid, fawn, identity, social, woo
Example Output:
kid