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: I was feeling really sick. Sentence2: We were lined up for the bathroom. Sentence3: I sat on the floor. Sentence4: The teacher told me to go to her. Sentence5: I walked up to her and vomited on her feet.

Ex Output:
I (myself), Teacher

Ex Input:
Sentence1: Sam wanted to learn how to read. Sentence2: He thought his friends would mock his illiteracy. Sentence3: But when they found out, they were all very kind. Sentence4: They even volunteered to teach him his letters. Sentence5: After months of studying, Sam became a great reader!

Ex Output:
His friends, Sam

Ex Input:
Sentence1: Madison really wanted to buy a new car. Sentence2: She applied to work at different restaurants around town. Sentence3: One day a local restaurant hired her to be their new waitress! Sentence4: Molly worked very hard as a waitress and earned a lot of tips. Sentence5: A few months later she was able to use her tip money to buy a new car!

Ex Output:
Madison, Molly