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  1. using System;
  2. using System.Text.RegularExpressions;
  3. using System.Collections.Generic;
  4. using System.Linq;
  5.  
  6.  
  7. namespace ConsoleApp18
  8. {
  9.     class Program
  10.     {
  11.         static void Main(string[] args)
  12.         {
  13.             int n = int.Parse(Console.ReadLine());
  14.             int countRegistrations = 0;
  15.             for (int i = 0; i < n; i++)
  16.             {
  17.                 string text = Console.ReadLine();
  18.                 string pattern = @"(U\$)([A-Z]{1}[a-z]{2,})\1(P@\$)([A-z]{5,}.*\d+)\3";
  19.                 Regex regex = new Regex(pattern);
  20.                 if (regex.IsMatch(text))
  21.                 {
  22.                     Console.WriteLine("Registration was successful");
  23.                     Match match = regex.Match(text);
  24.                     Console.WriteLine($"Username: {match.Groups[2]}, Password: {match.Groups[4]}");
  25.                     countRegistrations++;
  26.                 }
  27.                 else
  28.                 {
  29.                     Console.WriteLine("Invalid username or password");
  30.                 }
  31.             }
  32.             Console.WriteLine($"Successful registrations: {countRegistrations}");
  33.         }
  34.     }
  35. }
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