Definition: 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: Mel was nine and wanted grow tall. Sentence2: He decided to take vitamins and eat healthy. Sentence3: He did special stretching exercises, too. Sentence4: On his tenth birthday he was measured again. Sentence5: He was ecstatic to see he had grown half a foot!
Output:
Mel