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: drink, detestings, whirlpool, main, current
Example Output: detestings

Example Input: tools, disappointed, thing, content, file
Example Output:
disappointed