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: Sally had been riding her bike with training wheels. Sentence2: She was scared to take them off permanently. Sentence3: After falling off once, she was scared to try again. Sentence4: One day, Sally noticed none of her friends had them on. Sentence5: She decided to go for it and rode around without them.
A:
Sally, Her friends