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: Todd has been in the hospital for many days. Sentence2: The doctors say there is sign of recovery. Sentence3: His family is planning for the worst. Sentence4: Later in the week Todd's doctor said he was pulling the plug. Sentence5: Todd was pronounced at at 6 pm today.
Example Output: Family, Doctors, Todd

Example Input: Sentence1: Simon didn't like anyone and no one liked him either. Sentence2: He was mean and liked to hurt little animals. Sentence3: One day, a young boy went to him with a frog. Sentence4: Simon took the frog and was about to hurt it when the boy screamed. Sentence5: Simon was so touched, he put the frog on the ground and left.
Example Output: Boy, Simon, Frog

Example Input: Sentence1: Mike was playing basketball by himself. Sentence2: And he noticed someone who was able to make shots from very far away. Sentence3: Mike asked he if could play. Sentence4: But the person refused. Sentence5: Mike practiced until the he was able to play with the other person.
Example Output:
Mike, Someone