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: Consider Input: Sentence1: Anna was jogging with her phone in her pocket. Sentence2: Suddenly she heard a noise and looked down. Sentence3: Her phone had fallen out of her pocket! Sentence4: Scared, she bent down to pick it up. Sentence5: She was so relieved to see it wasn't cracked!

Output: Anna

Input: Consider Input: Sentence1: Ella wrote her grandma a letter. Sentence2: She went to the post office to mail it. Sentence3: But they told her she needed a stamp! Sentence4: A kind stranger gave little Ella the stamp. Sentence5: Ella happily posted her letter.

Output: Ella, Stranger, Grandma

Input: Consider Input: Sentence1: Nicole was trying to get her driver's license. Sentence2: Unfortunately she wasn't sure how to drive, so I offered to help! Sentence3: I took her to the park and had her drive around the grass. Sentence4: She was doing great and seemed confident enough to take the test. Sentence5: The next day she took the test and passed!
Output: I (myself), Nicole