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: John is a singer. Sentence2: He used to sing every night at the local bar. Sentence3: One day he was invited to a TV show. Sentence4: John became famous. Sentence5: He doesn't sing anymore at the local bar.
Tv show, John, Singer, Local bar