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

namespace A_Miner_Task
{
    class Program
    {
        static void Main(string[] args)
        {
            Dictionary<string, int> resourcesAndQuantities = new Dictionary<string, int>();

            while (true)
            {
                string resources = Console.ReadLine();
                if (resources == "stop")
                {
                    break;
                }
                int quantity = int.Parse(Console.ReadLine());
                if (!resourcesAndQuantities.ContainsKey(resources))
                {
                    resourcesAndQuantities.Add(resources, 0);

                }
                resourcesAndQuantities[resources] += quantity;
            }

            foreach (var type in resourcesAndQuantities)
            {
                Console.WriteLine($"{type.Key} -> {type.Value}");
            }
        }
    }
}