You will be given a definition of a task first, then some input of the task.
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: Tom's window let a lot of light into his bedroom. Sentence2: The light hits him right in the face while he tries to sleep. Sentence3: Eventually Tom decided to buy thicker curtains. Sentence4: He got some specifically made to block out light. Sentence5: After that Tom was able to sleep much better.
Output:
Tom