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: summer, roll, plummet, fall, exercise
Example Output: summer

Example Input: plain, mansion, condominium, squashed, flat
Example Output: plain

Example Input: loveful, falling, melancholy, emotional upsets, down
Example Output:
falling