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: Jason feels heartbroken after his girlfriend leaves him. Sentence2: His friends are worried that he is becoming despondent. Sentence3: Finally one friend encourages Jason to start boxing lessons together. Sentence4: Jason finds the physical activity helps him forget his lost love. Sentence5: Finally Jason begins to think he can love again.
Output:
Friends, Jason, Friend