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: Jake was playing with his cat. Sentence2: His cat was playing very aggressively. Sentence3: His cat scratched directly in the eye. Sentence4: Jake had to go to the hospital afterwards. Sentence5: Jake had to get surgery in order to fix his eye.
The hospital, Jake, Cat