5

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

namespace ExamPreparation
{
    public sealed class Book
    {
        public Book(string author, decimal price)
        {
            this.Author = author;
            this.Price = price;
        }

        public string Author { get; private set; }

        public decimal Price { get; set; }

        public override string ToString()
        {
            return $"{this.Author} -> {this.Price:F2}";
        }
    }

    public sealed class Library
    {
        public Library()
        {
            this.Books = new List<Book>();
        }

        public List<Book> Books { get; set; }

        public override string ToString()
        {
            StringBuilder output = new StringBuilder();

            foreach (var book in this.Books.OrderByDescending(b => b.Price).ThenBy(b => b.Author))
            {
                output.AppendLine(book.ToString());
            }

            return output.ToString().Trim();
        }
    }


    public sealed class Startup
    {
        public static void Main()
        {
            int n = int.Parse(Console.ReadLine());
            Library library = new Library();

            for (int i = 0; i < n; i++)
            {
                string[] tokens = Console.ReadLine().Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
                string authorName = tokens[1];
                decimal bookPrice = decimal.Parse(tokens[tokens.Length - 1]);

                if (library.Books.Any(b => b.Author == authorName))
                {
                    library.Books.Find(b => b.Author == authorName).Price += bookPrice;
                }
                else
                {
                    Book book = new Book(authorName, bookPrice);
                    library.Books.Add(book);
                }
            }

            Console.WriteLine(library);
        }
    }
}