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: I was taking a long business trip one evening. Sentence2: I got terribly lost and my cell phone had died. Sentence3: It was dark and began to rain and I felt myself getting very anxious. Sentence4: I pulled into a gas station and asked for directions. Sentence5: In an hour I arrived safely at the hotel and fell asleep!
Example Output: I (myself)

Example Input: Sentence1: Ava needed a root canal badly- she was always in pain. Sentence2: But she was terrified of dentists! Sentence3: Finally the agony drove her to make an appointment. Sentence4: The dentist was very kind when she arrived, and put her at ease. Sentence5: And to her shock, the root canal didn't hurt one bit!
Example Output: Dentist, Dentists, Ava

Example Input: Sentence1: Neil Trained very hard at NASA to be an astronaut. Sentence2: He finally was scheduled for a mission to the space station. Sentence3: Neil was very excited and quite a bit nervous too. Sentence4: When the day came he was ready and willing to go to space. Sentence5: Neil blasted off without trouble and had a great trip.
Example Output:
Neil