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: Penelope had never felt a strong connection to her grandmother. Sentence2: She felt bad that her sister had so much in common with their grandma. Sentence3: After their grandma died, Penelope had to sort through her old photos. Sentence4: She was surprised to find a photo of her grandma on a basketball team. Sentence5: A basketball player herself, Penelope now felt a special connection!
Output:
Penelope, Grandmother, Sister