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: fly, flutter, bus, drive, fish
Example Output: fish

Example Input: jog, car, bike, bats, fly
Example Output: bats

Example Input: angry, joyful, tools, fearful, content
Example Output:
tools