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.

Example Input: Sentence1: Lily was in a bad friendship. Sentence2: She didn't want to be in it anymore. Sentence3: So she decided to not be in it. Sentence4: It was painful. Sentence5: But it was also worth it.
Example Output: Lily

Example Input: Sentence1: Iris put on blue contacts. Sentence2: She looked at herself in the mirror. Sentence3: She thought she looked weird. Sentence4: She replaced the contacts. Sentence5: She thought she looked better in brown.
Example Output: Iris

Example Input: Sentence1: Katie just moved into a new apartment. Sentence2: She kept hearing loud noises every night at midnight. Sentence3: Her neighbors were in a band. Sentence4: They practiced every night and she finally had to complain. Sentence5: The neighbors moved out and Katie got to sleep.
Example Output:
Neighbors, Katie