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: Jim was sitting alone in his room, bored. Sentence2: He decided to go out and do something. Sentence3: He tagged the stop sign at the end of his street. Sentence4: A cop sat in his cruiser and watched him do it. Sentence5: Jim got sentenced to six months in juvenile detention.

Output: Cop, Jim

Input: Consider Input: Sentence1: Sam's glasses broke while he was playing football. Sentence2: They snapped in half right in the middle. Sentence3: Sam had to use tape to hold them together. Sentence4: He was embarrassed - until his brother said he resembled Harry Potter! Sentence5: Then Sam was proud of his cool, stylish glasses!

Output: Brother, Harry potter, Sam

Input: Consider Input: Sentence1: Gating was a distance runner. Sentence2: He had to do a 1600 meter relay. Sentence3: He was the anchor leg. Sentence4: He flew around the track. Sentence5: His teeth were clenched tightly.
Output: Gating