Harry Potter by J.K. Rowling, A Tale of Two Cities by Charles Dickens, To Kill a Mockingbird by Harper Lee, The Catcher in the Rye by J.D. Salinger
给定一组书籍，将它们分类成3个子类。
小说: Harry Potter by J.K. Rowling, A Tale of Two Cities by Charles Dickens, To Kill a Mockingbird by Harper Lee
经典: The Catcher in the Rye by J.D. Salinger
现代文学: To Kill a Mockingbird by Harper Lee