You will be given a definition of a task first, then some input of the task.
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: David took his children to the state park to look at the wildlife. Sentence2: They drove around until they saw a group of brown bears mingling. Sentence3: David parked the car and they began to observe the bears. Sentence4: One small cub walked up to the car and opened the door. Sentence5: Surprised, Andy quickly closed the door.
Output:
Cub, Bears, Andy, Children, David