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: Mavis turned up her music really loud. Sentence2: Her neighbors were having an argument outside. Sentence3: No matter how loud she turned up the music she could hear them. Sentence4: Mavis beat on the walls telling them to shut up. Sentence5: They told her she didn't have to be so rude.

Output: Neighbors, Mavis

Input: Consider Input: Sentence1: Pat made himself a jetpack out of some spare parts. Sentence2: He gave it a quick test for safety before he tried it himself. Sentence3: Pat strapped the jetpack to himself on the test pad he made. Sentence4: He looked at the sky and switched on the engine. Sentence5: Pat took off and zoomed away into the sky.
Output: Pat