Q: 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.
Sentence1: Billy thought his girlfriend was cheating on him. Sentence2: He would catch her on the phone with another person. Sentence3: He wanted to catch her in the act. Sentence4: He came home early from work one day. Sentence5: There was another man in her house.
A:
Billy, Another person, His girlfriend, Man