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


namespace Registration
{
    class Program
    {
        static void Main(string[] args)
        {
            string pattern = @"(U\$)([A-z][a-z]{2,})(\1)P\@\$([a-z]{5,}([A-Z]+)?[0-9]+)P\@\$";
            Regex regex = new Regex(pattern);
            int count = 0;
            int n = int.Parse(Console.ReadLine());
            for (int i = 0; i < n; i++)
            {
                string input = Console.ReadLine();
                bool matchRequirement = regex.IsMatch(input);
                if (matchRequirement)
                {

                    Match data = regex.Match(input);



                    string group = data.Groups[4].Value;






                    Console.WriteLine("Registration was successful");

                    Group username = data.Groups[2];

                        Console.WriteLine($"Username: {username}, Password: {group}");


                        count++;

                }
                else
                {
                    Console.WriteLine("Invalid username or password");
                }
            }

            Console.WriteLine($"Successful registrations: {count}");
        }
    }
}