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: Tori was running late to school. Sentence2: She rushed around looking for her shoes. Sentence3: She couldn't find them anywhere! Sentence4: By the time she finally found them, she had missed her bus. Sentence5: Her father had to take her to school that day.

Ex Output:
Father, Tori

Ex Input:
Sentence1: Marcus was playing his guitar at school. Sentence2: His friend Matthew approached him and asked about the music. Sentence3: Soon they were in a heated conversation about their music tastes. Sentence4: The duo decided that they should collaborate on some music. Sentence5: The resulting album was very popular with all of their friends.

Ex Output:
Marcus, Their friends, Matthew

Ex Input:
Sentence1: Some kids set off fireworks on a mesa. Sentence2: The grass on the mesa burned. Sentence3: The fire came close to some houses. Sentence4: Firefighters put out the fire. Sentence5: Nobody was hurt.

Ex Output:
Firefighters, Kids