using System;

using System.Linq;

using System.Collections.Generic;

​

public class Program

{

    public static void Main(string[] args)

    {

        Library Lib = new Library();

        int num = int.Parse(Console.ReadLine());

        fillLibrary(Lib, num);

​

        foreach (var a in Lib.final.OrderByDescending(x => x.Value).ThenBy(x=>x.Key))

        {

            Console.WriteLine("{0} -> {1:f2}",a.Key,a.Value);

        }

    }

​

    private static void fillLibrary(Library Lib, int num)

    {

        for (int i = 0; i < num; i++)

        {

            string[] a = Console.ReadLine().Split();

            Book myBook = new Book() { Title = a[0], Author = a[1], Publisher = a[2], ReleaseDate = a[3], ISBN = a[4], Price = decimal.Parse(a[5]) };

            if (!Lib.final.ContainsKey(myBook.Author))

            {

                Lib.final.Add(myBook.Author, myBook.Price);

            }

            else

            {

                Lib.final[myBook.Author] += myBook.Price;

            }

        }

    }

​

}

​

public class Library

{

    public string Name { get; set; }

    public Dictionary<string, decimal> final = new Dictionary<string, decimal>();

}

​

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; }

}