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: John did not know how to roller skate. Sentence2: His friend said that he would teach him. Sentence3: They spent all day practicing skating. Sentence4: John kept trying and got very good. Sentence5: Now he roller skates all over the neighborhood.

SOLUTION: John, Friend

PROBLEM: Sentence1: Jane was jogging. Sentence2: It had just rained. Sentence3: The ground was slippery with leaves. Sentence4: She slipped on one and broke her leg. Sentence5: She had to call an ambulance for help.

SOLUTION: Jane, Slippery, Broke, Rain, Ambulance

PROBLEM: Sentence1: It was my friend's birthday, and I wanted to do something special. Sentence2: After hours of deliberation, I decided to bake a cake. Sentence3: I spent some time researching recipes and looking at pictures. Sentence4: After gathering the ingredients, I mixed them and put it in the oven. Sentence5: Unfortunately, I forgot the cake and it burned.

SOLUTION:
I (myself), Friend