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: Kaya walked to school in the morning. Sentence2: It was a lovely day. Sentence3: But after class, it had begun to rain! Sentence4: Poor Kaya had brought no umbrella. Sentence5: She was forced to walk home in the rain.
Output:
Kaya