Login

package src;

import java.util.Scanner;

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

        String userName = scanner.nextLine();
        String password = "";

        for (int position = userName.length() - 1; position >= 0; position--) {
            char currentSymbol = userName.charAt(position);
            password += currentSymbol;

        }
            String input = scanner.nextLine();
            int countFailed = 0;
            while (!input.equals(password)) {
                countFailed++;
                if (countFailed == 4) {
                    System.out.printf("User %s blocked!", userName);
                    break;
                }
                System.out.println("Incorrect password. Try again.");
                input = scanner.nextLine();
            }

            if (input.equals(password)) {
                System.out.printf("User %s logged in.", userName);
            }
        }
    }