using System;
using System.Collections.Generic;

namespace _06.AMinerTask
{
    class MinerTask
    {
        static void Main(string[] args)
        {
            string input = Console.ReadLine();
            Dictionary<string, long> collected = new Dictionary<string, long>();
            while (input != "stop")
            {
                if (!collected.ContainsKey(input))
                {
                    collected.Add(input, 0);
                }
                collected[input] += long.Parse(Console.ReadLine());
                input = Console.ReadLine();
            }
            foreach (var pair in collected)
            {
                Console.WriteLine("{0} -> {1}", pair.Key, pair.Value);
            }
        }
    }
}