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: Mark and Jim went out fishing so they could have something for dinner. Sentence2: The two worked hard but it was hot and there were no fish. Sentence3: Jim suggested trying a new spot in the shade. Sentence4: The new spot worked and they brought in half a dozen fish. Sentence5: That night they had a delicious meal they were proud of.
Jim, Mark

Sentence1: Sara wanted to make her community more eco-friendly. Sentence2: She started a recycling program. Sentence3: There, she taught people how to recycle various types of items. Sentence4: Soon her neighbors were recycling almost everything they could! Sentence5: Sara felt very good about her environmental impact.
Sara, Her neighbors, People

Sentence1: Billy gathered the soap and called to his dog Rover. Sentence2: Billy goat Rover into the bathtub. Sentence3: Rover stayed still for a moment but then jumped out covered in soap. Sentence4: Billy chased Rover through the house. Sentence5: Billy finally had to hose Rover off in the yard to finish the bath.
Billy, His dog, Rover