Definition: 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: Johnny was putting fresh seed into the birdcage. Sentence2: Before he know it, the parakeet flew out the cage door. Sentence3: He chased her around the room. Sentence4: Finally he got tired and sat down. Sentence5: As soon as he did, the bird landed on his hand!
Output:
Johnny