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: Tanner needed a way to install his jewelry cabinet on his wall. Sentence2: He tried attaching it with command hooks but they fell off in a day. Sentence3: He did not have any power tools to work with. Sentence4: He forced some screws into the wall with a screwdriver. Sentence5: To his surprise, that held up well and worked for years.
Output:
Tanner