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'm a big fan of pixel art. Sentence2: I express my fandom by making bead art of sprites. Sentence3: I melt the beads together so they fuse forever. Sentence4: It is a time-consuming but fun process. Sentence5: Now my walls are covered in bead-based pixel art.

Ex Output:
I (myself)

Ex Input:
Sentence1: It was early December. Sentence2: My mom had been fighting cancer. Sentence3: She knew her time was near. Sentence4: She promised she would look after me in heaven. Sentence5: She died in her sleep.

Ex Output:
I (myself), My mom

Ex Input:
Sentence1: Amy always brought her lunch with her to school. Sentence2: One day she decided to buy her lunch at school. Sentence3: Amy sat with her friends and began to eat the soup she bought. Sentence4: No one else thought the soup tasted weird. Sentence5: An hour later Amy vomited all over her desk in class.

Ex Output:
Amy, Friends