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.
Q: Sentence1: Ali was frozen where she stood. Sentence2: Her sister had brought her with to a friends house. Sentence3: The friend's sister was a bully who hated Ali. Sentence4: Ali watched in shock as the bully approached her. Sentence5: Before she knew what happened, they were in a full on fight.
A:
Ali's sister, Friend's sister, Ali