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

namespace ConsoleApp2
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] userNames = Console.ReadLine().Split(", ");

            List<string> validUserNames = new List<string>();

            for (int i = 0; i < userNames.Length; i++)
            {
                string user = userNames[i];
                int count = 0;
                if (user.Length >= 3 && user.Length <= 16)
                {
                    foreach (var symbol in user)
                    {
                        if (char.IsLetterOrDigit(symbol) || symbol == '-' || symbol == '_')
                        {
                            count++;
                        }

                    }
                    if (count == user.Length)
                    {
                        validUserNames.Add(user);
                    }
                }
            }

            Console.WriteLine(string.Join(Environment.NewLine, validUserNames));
        }
    }
}