Q: 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: John thought it would be cool if he grew his own Christmas tree. Sentence2: So John grabbed seeds for a Christmas tree. Sentence3: He planted the seed in his yard. Sentence4: It grew into a big tree. Sentence5: During Christmas he cut the tree and put it in his living room.
A:
John