Login

import java.util.Scanner;

public class Login {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String userName = scanner.nextLine();
        String userPassword = scanner.nextLine();

        String backwards = new StringBuilder(userName).reverse().toString();
        int counter = 0;

            while (!userPassword.equals(backwards)) {
            System.out.println("Incorrect password. Try again.");
            userPassword = scanner.nextLine();
                counter++;
                if (counter >= 3) {
                    System.out.printf("User %s blocked!", userName);
                    break;
                }
            }
        if(userPassword.equals(backwards)){
            System.out.printf("User %s logged in.", userName);
        }
    }
}