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: Anna loved pandas. Sentence2: Her zoo was having a panda exhibit. Sentence3: She was so excited! Sentence4: She went the first day the exhibit opened. Sentence5: She had such a wonderful time!

Output: Anna, Zoo

Input: Consider Input: Sentence1: Will was moved up a grade because he was so smart. Sentence2: The teachers warned his dad that he wouldn't grow emotionally. Sentence3: His dad insisted on moving him up a grade. Sentence4: Will was hated throughout school. Sentence5: He is now a very confused and disliked adult.

Output: Will, Dad, School, Teachers

Input: Consider Input: Sentence1: The baby managed to get out of the tent. Sentence2: He ended up falling into the water. Sentence3: Although he was able to float, the current pushed him. Sentence4: Dan tried running after him before he drowned. Sentence5: He managed to pull the baby out within minutes.
Output: Baby, Dan