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

namespace ITCareer_OOP_Exam_1
{
    class Program
    {
        static void Main(string[] args)
        {
            //до получаване на Stop shopping -> четем стринг

            string input = Console.ReadLine();
            Dictionary<string, double> products = new Dictionary<string, double>();
            double totalSum = 0;

            while(input != "Stop shopping")
            {
                //"milk-1.2" -> ["milk", "1.20"]
                string productName = input.Split("-")[0];
                double productPrice = double.Parse(input.Split("-")[1]);
                totalSum += productPrice;

                //1. да имаме продукта
                if (products.ContainsKey(productName))
                {
                    products[productName] = products[productName] + productPrice;
                }
                //2. да го нямаме
                else
                {
                    products.Add(productName, productPrice);
                }

                input = Console.ReadLine();
            }


            var sorted = products.OrderBy(pair => pair.Value);

            foreach(var pair in sorted)
            {
                Console.WriteLine($"{pair.Key} -> {pair.Value:F2}");
            }

            Console.WriteLine($"Total sum: {totalSum:F2}");





        }
    }
}