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.

Sentence1: Jackie was practicing his kung fu moves. Sentence2: He accidentally hit a girl. Sentence3: He apologized, but the girl got into fighting position. Sentence4: She swung her fists and Jackie realized she was a martial arts expert. Sentence5: He could just barely keep up and ended up conceding the fight.
Girl, Jackie