Detailed Instructions: 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.
Q: Sentence1: Gabriel had climbed into a tree. Sentence2: He was scared to climb down. Sentence3: Gabriel tried to jump out of the tree. Sentence4: He landed hard on his ankle. Sentence5: Gabriel sprained his ankle.
A:
Gabriel