Registration workers at a conference for authors of children's books have collected data about conference participants, including the number of books each author has written and the target age of readers. The participants have written 1 to 40 books each, and target readers' ages range from 0 through 16. Design a program that continuously accepts an author's name, number of books written, and target reader age until a sentinel value is entered. Then display a list of how many participants have written each number of books.

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