Instructions: 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.
Input: Sentence1: Hank made an appointment to see a house. Sentence2: He was supposed to meet the realtor at his office. Sentence3: Hank didn't see the agent's office and drove right by it. Sentence4: He continued on to the house itself. Sentence5: Hank called the agent to ask to meet him there at the house instead.
Output:
Hank, Realtor