import java.util.Scanner;

class Database {
	String[] userid = new String[2];
	{
		userid[0] = "admin";
	}

	Scanner input = new Scanner(System.in);
	int arrayindex = 1;
	String username;

	void Database(String invoke) {
		while (arrayindex < userid.length) {

			System.out.println("Register username");
			username = input.nextLine();
			userid[arrayindex] = username;

			arrayindex++;

		}
	}

}

public class App {

	public static void main(String[] args) {

		Database Machine = new Database();
		Scanner input = new Scanner(System.in);
		String login;
		int indexcount = 1;

		Machine.Database("invoke");

		System.out.println("enter login info");

		while (indexcount < Machine.userid.length) {
			login = input.nextLine();
			if (login.equals(Machine.userid[indexcount])) {
				System.out.println("logged in");
				indexcount++;
			} else {
				System.out.println("wrong account");
			}

		}

	}

}