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.
Input: Sentence1: Cindy was only learning how to bake. Sentence2: But her friends thought she was really good. Sentence3: One of them suggested baking a birthday cake for someone. Sentence4: But she knew she wasn't good enough. Sentence5: After enough peer pressure, she ended up baking a terrible cake.
Output:
Someone, Friends, Cindy