import java.io$.*$;

import java.net.$*$;

import java.util.$*$;

public class MiddleServer $\{$

private static Map users $=$ new HashMap;

public static void main$($String$[]$ args$)$ throws IOException $\{$

int port $=$ Integer.parseInt$($args$[0])$;

loadUsers$()$;

ServerSocket serverSocket $=$ new ServerSocket$($port$)$;

while $($true$)\{$

new ClientHandler$($serverSocket$.$accept$()).$start$()$;

$\}$

$\}$

private static void loadUsers$()$ throws IOException $\{$

$//$ Load users from userList.txt

$\}$

private static class ClientHandler extends Thread $\{$

private Socket socket;

public ClientHandler$($Socket socket$)\{$

this.socket $=$ socket;

$\}$

public void run$()\{$

try $($BufferedReader input $=$ new BufferedReader$($new InputStreamReader$($socket$.$getInputStream$()))$;

PrintWriter output $=$ new PrintWriter$($socket$.$getOutputStream$(),$ true$))\{$

String credentials $=$ input.readLine$()$;

String$[]$ parts $=$ credentials.split$("")$;

String username $=$ parts$[0]$;

String password $=$ parts$[1]$;

if $($authenticate$($username$,$ password$))\{$

output.println$("$SUCCESS$")$;

$//$ Connect to appropriate group server

$\}$ else $\{$

output.println$("$FAIL$")$;

$\}$

$\}$ catch $($IOException e$)\{$

e$.$printStackTrace$()$;

$\}$

$\}$

private boolean authenticate$($String username, String password$)\{$

User user $=$ users.get$($username$)$;

return user $!=$ null && user.password.equals$($password$)$;

$\}$

$\}$

private static class User $\{$

String username;

String password;

String group;

int points;

$//$ Constructor and other methods

$\}$

$\}$

$"$ I need $"$ Send me the instructions to execute and Outputs of this program $"$