Book_Library

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

namespace Book_Library
{
    public class Book
    {
        public string Title { get; set; }
        public string Author { get; set; }
        public string Publisher { get; set; }
        public string ReleaseDate { get; set; }
        public string ISBN { get; set; }
        public decimal Price { get; set; }

    }
    public class Library
    {
        public string Name { get; set; }
        public List<Book> Books {get;set;}

        public Library()
        {
            Books = new List<Book>();
        }
    }
   public class Program
    {
       public static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            Library Library = new Library();
            Dictionary<string, decimal> dict = new Dictionary<string, decimal>();

            for (int i = 0; i < n; i++)
            {
                Book currentBook = new Book();
                var input = Console.ReadLine().Split(new char[] { ' ' },StringSplitOptions.RemoveEmptyEntries).ToArray();

                currentBook.Title = input[0];
                currentBook.Author = input[1];
                currentBook.Publisher = input[2];
                currentBook.ReleaseDate = input[3];
                currentBook.ISBN = input[4];
                currentBook.Price =decimal.Parse( input[5]);

                Library.Books.Add(currentBook);
                if (!dict.Keys.Contains(currentBook.Author))
                {
                    dict.Add(currentBook.Author, currentBook.Price);
                }
                else
                {
                    dict[currentBook.Author] += currentBook.Price;
                }
            }
            foreach (var item in dict.OrderBy(x=>-x.Value).ThenBy(x=>x.Key))
            {
                Console.WriteLine("{0} -> {1}",item.Key,item.Value);
            }
        }
    }

}