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

namespace ConsoleApp4
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = Console.ReadLine();
            Dictionary<string, int> resourses = new Dictionary<string, int>();

            while (input != "stop")
            {
                string resourse = input;
                int quantity = int.Parse(Console.ReadLine());
                AddResourse(resourses, resourse, quantity);
                input = Console.ReadLine();
            }
            foreach (var kvp in resourses)
            {
                Console.WriteLine($"{kvp.Key} -> {kvp.Value}");
            }
        }
        public static void AddResourse(Dictionary<string, int> resourses, string resourse, int quantity)
        {
            if (!resourses.ContainsKey(resourse))
            {
                resourses.Add(resourse, 0);
            }
            resourses[resourse] += quantity;
        }
    }
}