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: Annie had a test on Monday. Sentence2: She went bowling on Friday. Sentence3: She went to the mall on Saturday. Sentence4: She watched TV on Sunday. Sentence5: Annie failed her test.
Example Output: Annie

Example Input: Sentence1: Jeff had been job searching for a while now. Sentence2: One day h got two offers from two different companies! Sentence3: One job paid more while the other job had much better benefits. Sentence4: Jeff thought about which one to take all day long. Sentence5: He decided to take the higher paying job.
Example Output: Jeff

Example Input: Sentence1: Tom and his friends decided to go hiking. Sentence2: While hiking Tom tripped and fell down a cliff. Sentence3: He was injured so his friends called for help. Sentence4: Search and rescue came and saved Tom. Sentence5: After a two weeks in the hospital Tom recovered.
Example Output:
Search and rescue, His friends, Tom