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: Anna was pregnant and feared giving birth. Sentence2: She started to attend lamaze classes. Sentence3: The classes taught her to control her mind and her breathing. Sentence4: They helped her feel calm and reduce her fear. Sentence5: Anna used lamaze to help her during childbirth.
Classes, Anna