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: Clay is roaming around the museum. Sentence2: Suddenly he sees an exhibit about planes. Sentence3: He runs over and jumps on one of the planes. Sentence4: He gets warned he's not supposed to climb on exhibits. Sentence5: Clay still enjoyed the museum.
Output:
Clay