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: Jason was incarcerated in a state penitentiary. Sentence2: He was serving a life sentence so had dreams of escaping. Sentence3: He used a small spoon to dig a hole in the wall of his cell. Sentence4: Jason used the tunnel to escape the prison on a stormy night. Sentence5: Jason lived the rest of his life in a little town in Mexico.
Output:
Jason