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.

Input: Consider Input: Sentence1: Bob called Erica to ask her to a Valentine's Day date. Sentence2: She told him yes that she would love to go with him. Sentence3: He was excited about the upcoming date. Sentence4: He planned everything for the perfect night. Sentence5: When he picked her up she was smiling and happy.

Output: Bob, Erica

Input: Consider Input: Sentence1: Jim liked to watch sports, but never played. Sentence2: He mostly wished he was better at basketball. Sentence3: Jim's friends eventually encouraged him to join the basketball team. Sentence4: After lots of practice, Jim's skills increased. Sentence5: Now Jim is the best player on the team, and he feels accomplished.

Output: Jim, Jim's friends

Input: Consider Input: Sentence1: Rod had admired a cashier at work, Dotty, for several months. Sentence2: He finally got the courage to ask her out to dinner and a movie. Sentence3: Determined to make the night memorable, he purchased pricy flowers. Sentence4: But when he presented them to her, she immediately sneezed. Sentence5: Dotty was severely allergic to pollen, and sniffled the whole date.
Output: Rod, Dotty