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: Martha stared at the glowing television screen, unblinking. Sentence2: Her hands gripped the blanket tightly. Sentence3: The television drama was reaching the climax of the episode. Sentence4: When the twist was revealed, Martha let out a scream. Sentence5: She immediately called her best friend.
Output:
Martha, Best friend