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: My niece D had a child in 1999. Sentence2: When the child was six, the school suggested testing. Sentence3: They thought the child needed an individual learning program. Sentence4: D said that would not be necessary. Sentence5: A few years later D had the child tested and got her into an ILP.
Output:
I (myself), The school, D, Child