Detailed Instructions: In this task, you're given a story (which contains five sentences only). Your task is to find all the characters which are available in the given story.
Problem:Sentence1: Paul's car broke down. Sentence2: He needed to go to work, so he called a friend to ask for a ride. Sentence3: Paul's friend said that he would pick him up from work. Sentence4: When Paul's friend arrived, one of his back tires was low. Sentence5: Paul had to catch a taxi to work.
Solution:
Paul, Friend