import java.util.Scanner;

public class PP11_2 {
    public static void main(String[] args)throws StringTooLongException {
        String A="",B;
        String message="y";
        Scanner scan = new Scanner(System.in);

        StringTooLongException problem = new StringTooLongException("You put in too long!");

        System.out.println("Please enter a word except 'DONE'.");
        B = scan.nextLine();
        A+=B;

        while(message.equalsIgnoreCase("y")) {
            while (B != "DONE") {
                System.out.println("Please enter a word.");
                System.out.println("Please enter 'DONE' if you want to quit.");
                B = scan.nextLine();
                A += B;

                if (B.equals("DONE"))
                    break;
            }
            System.out.println(A + "   Length: " + A.length());
            try
            {
                if (A.length() > 20)
                    throw problem;
            }
            catch (StringTooLongException e)
            {
                System.out.println("You put in too long!");
            }
            finally {
                System.out.println("DO you want to continue?");
                message = scan.nextLine();
            }
        }
    }
}