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: Sam went to the storage closet at work to get some supplies. Sentence2: The closet was locked so he took out his keys. Sentence3: Sam went through 25 of his 50 keys before he found the right one. Sentence4: Sam put a strip of tape to mark the key to the storage closet. Sentence5: Now Sam never had to waste time trying to find the key again.
Student:
Sam