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: frank, bold, brash, precise, pork
Example Output: pork

Example Input: bike, beetle, leap, ant, fly
Example Output: bike

Example Input: burn, fire, sack, water, blaze
Example Output:
sack