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: Kirk went to the bank to deposit a check. Sentence2: He was very late for work but stood in line anyway. Sentence3: The line moved very slowly. Sentence4: To pass the time he took a lollipop in one of the bowls. Sentence5: He had finished the lollipop when it was finally his turn.

Output: Kirk

Input: Consider Input: Sentence1: Tori was running late to school. Sentence2: She rushed around looking for her shoes. Sentence3: She couldn't find them anywhere! Sentence4: By the time she finally found them, she had missed her bus. Sentence5: Her father had to take her to school that day.

Output: Father, Tori

Input: Consider Input: Sentence1: AJ wanted to go to the ColdPlay concert for his birthday. Sentence2: He couldn't find tickets because they were sold out. Sentence3: His best friend Brianna came over to surprise him with tickets. Sentence4: They went together and had a blast. Sentence5: It was one of the best nights of his life.
Output: Aj