Definition: 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: Sentence1: Brad's grandmother got a new television. Sentence2: She didn't know how to connect the television to her satellite. Sentence3: She called Brad to help her. Sentence4: Brad went over and read the instructions and handbook. Sentence5: Brad was able to connect his grandmother's television.
Output:
Brad's grandmother, Brad