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.

Ex Input:
Sentence1: In college, I studied abroad in France. Sentence2: My 16-year-old host brother was very nice. Sentence3: I invited him to a party with me to meet some cool older kids. Sentence4: He misunderstood why I invited him. Sentence5: He tried to kiss me on the bus ride home.

Ex Output:
I (myself), Host brother, Older kids

Ex Input:
Sentence1: Simon invited his friend Joey over for a play-date. Sentence2: He was looking forward to playing Minecraft with his friend. Sentence3: Right before Joey arrived, the internet went out. Sentence4: Simon tried resetting the router, but it didn't help. Sentence5: Simon and Joey played outside until the router was back online.

Ex Output:
Simon, Joey

Ex Input:
Sentence1: Joe owned a carpentry business. Sentence2: The mayor of the city asked Joe to build housing for the homeless. Sentence3: Joe began building the housing but left his workers to finish it. Sentence4: When the housing was done, it had leaks in the roof. Sentence5: The mayor never hired Joe again.

Ex Output:
Workers, Joe, Homeless, Mayor