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: I needed to get groceries yesterday. Sentence2: I walked to the store instead of driving. Sentence3: On the way, I thought about what I needed to buy. Sentence4: I took my list into the store with me. Sentence5: I bought everything on the list, and had trouble carrying it home.
Example Output: I (myself)

Example Input: Sentence1: Jim was a football player. Sentence2: One day at practice he got hit really hard. Sentence3: He stood up and then fell back down. Sentence4: The team medic was sent over immediately. Sentence5: Jim was diagnosed with a concussion.
Example Output:
Jim