Teacher: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.
Teacher: Now, understand the problem? Solve this instance: Sentence1: John's phone would not stay powered on. Sentence2: The battery had gone bad. Sentence3: John headed to the cellular store. Sentence4: He purchased a new phone with a bright screen. Sentence5: John was happy with his purchase!
Student:
John