using System;
using System.Text;
using System.Text.RegularExpressions;

namespace _2._1_Registration
{
    class Program
    {
        static void Main(string[] args)
        {
            int number = int.Parse(Console.ReadLine());

            string passwordPattern = @"(U\$)([A-Za-z]{2,})\1(P\@\$)([A-Za-z]{5,}\d+)(P\@\$)";

            int count = 0;

            for (int i = 0; i < number; i++)
            {
                string input = Console.ReadLine();

                Match passwordMatch = Regex.Match(input, passwordPattern);


                if (passwordMatch.Success)
                {
                    Console.WriteLine("Registration was successful");
                    string username = passwordMatch.Groups[2].Value;
                    string password = passwordMatch.Groups[4].Value;

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

                    count++;

                }
                else
                {
                    Console.WriteLine("Invalid username or password");
                }
            }
            Console.WriteLine($"Successful registrations: {count}");


        }
    }
}