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: A family settled on a hotel. Sentence2: They got there the next day. Sentence3: Their bags were picked up for them. Sentence4: The lobby was their first view. Sentence5: They thought it was amazing.
Example Output: A family

Example Input: Sentence1: Jake wanted to join little league. Sentence2: He had asthma and his parents were worried. Sentence3: He convinced them to let him. Sentence4: He had a lot of fun. Sentence5: His parents decided to trust him more.
Example Output: His parents, Jake

Example Input: Sentence1: Nicholas was assigned a term paper in his economics class. Sentence2: It was on a topic about which he knew very little. Sentence3: Nicholas spent several days doing in-depth research. Sentence4: He wrote a ten page paper. Sentence5: Nicholas learned about a lot about his new topic.
Example Output:
Nicholas