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: David took his children to the state park to look at the wildlife. Sentence2: They drove around until they saw a group of brown bears mingling. Sentence3: David parked the car and they began to observe the bears. Sentence4: One small cub walked up to the car and opened the door. Sentence5: Surprised, Andy quickly closed the door.
Example Output: Cub, Bears, Andy, Children, David

Example Input: Sentence1: Ed's dream was to be a published author. Sentence2: He sent in many manuscripts to different publishers. Sentence3: Every time, his work was rejected. Sentence4: He decided to try one last time to get published. Sentence5: On his last try, the publisher finally accepted his work!
Example Output: Ed, Publisher

Example Input: Sentence1: Tess had bought a take and bake pizza. Sentence2: At home she put it into the oven. Sentence3: While she waited she sat in her room reading. Sentence4: Suddenly she realized too much time had passed. Sentence5: She rushed but it was too late and her pizza had burned.
Example Output:
Tess