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: Tim was brushing his teeth one morning. Sentence2: Tim noticed he was almost out of toothpaste. Sentence3: Tim decided to go to the store for more. Sentence4: Tim saw natural toothpaste. Sentence5: Tim tried natural toothpaste for the first time.

Ex Output:
Tim

Ex Input:
Sentence1: It was time to play games with my friends. Sentence2: We had four balls to play with. Sentence3: The best was the blue ball. Sentence4: Unfortunately, my friend Tim wanted to play with it. Sentence5: We both decided to compromise and share the blue ball.

Ex Output:
I (myself), Tim, My friends

Ex Input:
Sentence1: Amy was learning to cook for herself. Sentence2: She decided she would make beans to have as protein for a week. Sentence3: She spent hours soaking the beans before cooking them. Sentence4: After she put them on she laid down and fell asleep. Sentence5: Her mother woke her up to inform her the beans burned.

Ex Output:
Amy, Mother