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();

        List<string> authors = books.Select(a => a.Author).Distinct().OrderBy(x => x).ToList();

        foreach (var author in authors)
        {
            decimal totalPrice = books.Where(b => b.Author.Equals(author)).Select(p => p.Price = p.Price).Sum();
            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; }
}