Definition: 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.
Input: Sentence1: Jeff just turned 21. Sentence2: So he decided to try some alcohol. Sentence3: He became addicted and drank alcohol every day. Sentence4: But his family intervened. Sentence5: It took years for Jeff to get over his addiction.
Output:
Family, Jeff