using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;
using System.Linq;

namespace Courses
{
    class Program
    {
        static void Main(string[] args)
        {
            var inputType = new Dictionary<string, List<string>>();

            while (true)
            {
                List<string> command = Console.ReadLine().Split(" : ").ToList();
                if (command[0] == "end")
                {
                    break;
                }

                if (!inputType.ContainsKey(command[0]))
                {
                    inputType.Add(command[0], new List<string>());
                    inputType[command[0]].Add(command[1]);
                }
                else
                {
                    inputType[command[0]].Add(command[1]);
                }
            }
            foreach (var item in inputType.OrderByDescending(x => x.Value.Count))
            {

                Console.WriteLine($"{item.Key}: {item.Value.Count}");
                //var list = item.Value;

                foreach (var kvp in item.Value.OrderBy(n => n))
                {
                    Console.WriteLine($"-- {kvp}");
                }
            }
        }
    }
}