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: Brian and Karyn decided to make milkshakes for their friends. Sentence2: Brian used a wooden spoon to push the ice cream in the blender. Sentence3: The spoon got too close to the blades and splintered into pieces. Sentence4: Karyn and Brian strained the shakes and took out the wood splinters. Sentence5: No one ever found out about the splinters in the shakes.
A:
Brian, Friends, Friend, Karyn