Input username and password with stored credentials. Use a function to handle the login process, providing feedback on whether the login was successful or not. The user is allowed up to $5$ login attempts. If the login fails after $5$ attempts, the account will be locked. If the username is not found, the program should terminate immediately.$$

Requirements:$$

Create a function login$\_$system$($username$,$ password$)$ that:$$

Takes two arguments: a username and a password.$$

Checks if the username exists in the dictionary:$$

If the username is not found, return "Login failed: Username not found." and terminate the program immediately.$$

Compares the input password with the stored password:$$

If the passwords match exactly, return "Login successful!".$$

If only some characters match in the same positions, return how many characters match $($e$.$g$.,"3$ characters match" or $"1$ character matches"$).$

The program should allow up to $5$ attempts for the user to log in$.$

After each failed attempt, provide feedback on how many characters matched.$$

If the user fails all $5$ attempts, lock the account and display a message indicating that the account has been locked.$$

If the username is not found, terminate the program immediately without further attempts.$$

The program should stop once the user successfully logs in or after $5$ failed attempts.$$

Example Interaction $1($Successful Login$)$:$$

Enter your username: user$1$

Enter your password: pass$123$

Login failed: $3$ characters match.$$

Enter your password: password$123$

Login successful!$$

Example Interaction $2($Failed Login and Account Lock$)$:$$

Enter your username: user$2$

Enter your password: let$$

Login failed: $3$ characters match.$$

Enter your password: letmeout$$

Login failed: $6$ characters match.$$

Enter your password: wrongpassword$$

Login failed: $2$ characters match.$$

Enter your password: letitgo$$

Login failed: $4$ characters match.$$

Enter your password: openplease$$

Login failed: $2$ characters match.$$

Account locked due to too many failed attempts.$$

Example Interaction $3$:$$

Enter your username: user$4$

Enter your password: anypassword$$

Login failed: Username not found.$$

Notes:$$

The dictionary of usernames and passwords is predefined in the program.$$

The comparison should only count characters that match in the same positions.$$

Use a for loop to compare the password characters and count matches.$$

After each attempt, if the password doesn't match exactly, provide feedback on how many characters match in the correct position.$$

If the username is not found, the program should stop immediately without any password attempts.$$

If the username is found, allow up to $5$ attempts for the user to log in$.$