Given the task definition and input, reply with output. 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.

Sentence1: The boys were so excited they couldn't even sleep that night. Sentence2: It was Christmas morning and they sprang out of bed. Sentence3: They ran downstairs to the tree. Sentence4: There it was! Sentence5: The brand new Go Cart they had wanted.
The boys