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: Tom was in the shower. Sentence2: He heard someone knocking at the door. Sentence3: He rushed to the door. Sentence4: He only had a small towel. Sentence5: He was embarrassed but answered the door.
Example Output: Someone, Tom

Example Input: Sentence1: The Smiths love the corn maze. Sentence2: They attended this past year. Sentence3: Helen was very scared. Sentence4: Ethan told her she was okay. Sentence5: They ended up bonding over that.
Example Output: Attended, The smiths, Bonding, Ethan, Helen, Told

Example Input: Sentence1: Kaya walked to school in the morning. Sentence2: It was a lovely day. Sentence3: But after class, it had begun to rain! Sentence4: Poor Kaya had brought no umbrella. Sentence5: She was forced to walk home in the rain.
Example Output:
Kaya