Instructions: 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: Sam was taking out the trash. Sentence2: On the way there the bag broke. Sentence3: Trash went everywhere. Sentence4: Sam took a long time cleaning it back up. Sentence5: He decided to buy stronger bags next time.
Output:
Sam