import java.util.Scanner;

public class StringPassword {

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

        System.out.print("Enter username: ");
        String username = input.nextLine();

        System.out.print("Enter password: ");
        String password = input.nextLine();

        validatePassword(password, username);

    }

    private static void validatePassword(String password, String username) {
        boolean okay = true;

        if (password.length() < 8) {
            okay = false;
        }

        if (password.equals(username)) {
            okay = false;
        }

        if (okay == false) {
            System.out.println("NOT OK");
        } else {
            System.out.print("OK");
        }

    }

}