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: Graham was playing among his toys. Sentence2: He wanted to climb and tried using a toy box to do it. Sentence3: Suddenly the toy box snapped and broke. Sentence4: Graham was so sad because it was one of his favorite toys. Sentence5: He promised to be more careful with his toys from then on.
Graham