Q: 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.
Sentence1: Lily had spent the last ten years taking care of her senile sick nana. Sentence2: At first she was bitter, but caring for Nana taught her compassion. Sentence3: Lily learned that a person's value is more than what they can do. Sentence4: Her grandmother finally died, having not spoken for 10 years. Sentence5: Lily never forgot the lessons her grandmother taught her.
A:
Nana, Lily