Anyone know the 2.10.5: Sidewalk on codehs

Negative methods of behavior correction include all but this: sarcasm verbal abuse setting an example for proper behavior humiliation

Description: write function lastfirst() that takes one argument—a list of strings of the format "lastname, firstname" —and returns a list consisting of two lists: (a) a list of all the last names (b) a list of all the first names

Match the sentence fragment in the first column with the appropriate ending in the second column. a little per favore?