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: fritter, dunker, patty, waste, danish
Example Output: waste

Example Input: bike, flap, fly, walk, wave
Example Output: walk

Example Input: flat, down, melancholy, south, ground
Example Output:
melancholy