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: Tom moved out to the coast. Sentence2: He experienced his first earthquake. Sentence3: It was a minor one. Sentence4: Tom freaked out. Sentence5: His friends made fun of him.
Example Output: Friends, Tom

Example Input: Sentence1: It was early December. Sentence2: My mom had been fighting cancer. Sentence3: She knew her time was near. Sentence4: She promised she would look after me in heaven. Sentence5: She died in her sleep.
Example Output: I (myself), My mom

Example Input: Sentence1: Lucy and the girls were excited to go on a boating trip. Sentence2: The girls got on the boat and started paddling. Sentence3: The girls were having fun until they hit a large rock. Sentence4: The girls screamed, but then laughed at the incident. Sentence5: As a result, the girls jumped in the water and went for a swim.
Example Output:
Lucy, The girls