Detailed 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.
Q: Sentence1: Tyler's sleep schedule has been off due to final exams. Sentence2: He decided to stay up all Saturday in order to fix it. Sentence3: Tyler began dozing off while watching TV. Sentence4: He decided to drink coffee in order to keep himself up. Sentence5: Tyler managed to sleep on time after drinking a whole pot of coffee.
A:
Tyler