TASK 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.
PROBLEM: Sentence1: Nicholas was assigned a term paper in his economics class. Sentence2: It was on a topic about which he knew very little. Sentence3: Nicholas spent several days doing in-depth research. Sentence4: He wrote a ten page paper. Sentence5: Nicholas learned about a lot about his new topic.

SOLUTION: Nicholas

PROBLEM: Sentence1: Terena needed an apartment in New York. Sentence2: First she got a broker. Sentence3: Next the broker asked a lot of invasive questions. Sentence4: The broker demanded three years tax returns. Sentence5: Finally, her application was approved!

SOLUTION: Terena, Broker

PROBLEM: Sentence1: Reese made an astronaut helmet for his younger brother. Sentence2: The brother tried it on and started playing pretend. Sentence3: Reese went outside hours later. Sentence4: His brother had strapped fireworks to the back of his bicycle. Sentence5: As he lit the match, Reese ran out and yelled he wasn't an astronaut.

SOLUTION:
Reese, Brother