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: Randy was mentally retarded from a car crash early in his life. Sentence2: Randy loved the simple pleasures in life. Sentence3: His mother would take Randy on trips. Sentence4: One day Randy and his mother took a trip to the coast of carolina. Sentence5: Randy was overjoyed when he saw the ocean for the first time.
Randy, Mother

Sentence1: Jim's son is afraid to fly. Sentence2: He's seen too many stories about plane crashes. Sentence3: He can't sleep the night before they are set to fly to Denver. Sentence4: But by the time he gets on the plane he is exhausted. Sentence5: He is so tired that he sleeps all the way through the flight.
Jim's son

Sentence1: Bob pushed his kayak into the water. Sentence2: The water was icy cold. Sentence3: Bob stepped into the water. Sentence4: Bob screamed at the icy water. Sentence5: Bob dropped his paddle.
Bop