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: Tabby's funeral was closed casket. Sentence2: The damage from the accident was too severe to display the body. Sentence3: I had seen it immediately after the accident. Sentence4: It was so traumatizing that I blocked it from memory. Sentence5: I still have nightmares about it to this day.
Example Output: I (myself), Tabby

Example Input: Sentence1: Dave found an axe in his garage. Sentence2: He saw that it had red stains on it. Sentence3: He touched the stains. Sentence4: They were tacky like blood! Sentence5: Dave decided to leave the axe alone!
Example Output:
Dave