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: Ana wanted to be as fit as possible. Sentence2: For that purpose she bought an exercise machine. Sentence3: The machine was used 30 minutes every single day. Sentence4: By the time a month had ended she was much fitter. Sentence5: She felt quite pleased and proud of herself.
Output:
Ana