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: Larry was at a restaurant. Sentence2: He had called a cab to pick him up. Sentence3: It was getting to be almost an hour and no cab arrived. Sentence4: Larry called to ask what was up. Sentence5: It turned out that there was a mix up.

Ex Output:
Larry

Ex Input:
Sentence1: Dean's roof was damaged in the recent wind storm. Sentence2: He decided to fix the roof himself. Sentence3: He worked on it for two weeks before he asked for help. Sentence4: His friend Max came to help Todd finish the roofing project. Sentence5: Together they finished the roof and it looked amazing.

Ex Output:
Max, Dean

Ex Input:
Sentence1: Kim always made good grades. Sentence2: She was in high school now though. Sentence3: She had a big science test and had been studying hard. Sentence4: She was very anxious about it. Sentence5: When Kim got her test back she had failed.

Ex Output:
High school, Kim