Book Library

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;


class BookLibrary
{
    static void Main()
    {
        List<Book> books = new List<Book>();
        books = ReadLibrary();

        Dictionary<string, decimal> authors = new Dictionary<string,decimal>();

        foreach (var entry in books)
        {
            if (!authors.ContainsKey(entry.Author))
            {
                authors.Add(entry.Author,0);
            }
            authors[entry.Author] += entry.Price;
        }

        foreach (var entry in authors.OrderByDescending(x=>x.Value).ThenBy(x=>x.Key))
        {
            string author = entry.Key;
            decimal totalPrice = entry.Value;
            Console.WriteLine($"{author} -> {totalPrice:f2}");
        }
    }

    public static List<Book> ReadLibrary()
    {
        int n = int.Parse(Console.ReadLine());
        List<Book> lib = new List<Book>();
        for (int i = 0; i < n; i++)
        {
            Book book = ReadBook();
            lib.Add(book);

        }
        return lib;
    }

    public static Book ReadBook()
    {
        string[] inputData = Console.ReadLine().Split();
        Book book = new Book();
        book.Title = inputData[0];
        book.Author = inputData[1];
        book.Publisher = inputData[2];
        book.ReleaseDate = DateTime.ParseExact(inputData[3], "dd.MM.yyyy", System.Globalization.CultureInfo.InvariantCulture);
        book.ISBNNumber = inputData[4];
        book.Price = decimal.Parse(inputData[5]);
        return book;
    }
}

class Book
{
    public string Title { get; set; }
    public string Author { get; set; }
    public string Publisher { get; set; }
    public DateTime ReleaseDate { get; set; }
    public string ISBNNumber { get; set; }
    public decimal Price { get; set; }
}