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: Tim had a hard test coming up. Sentence2: It was in geometry, a subject he's weak in. Sentence3: Tim spent extra time studying. Sentence4: The day of the test he was nervous. Sentence5: Tim wound up getting a bad grade.
Output:
Tim