try
        {
            String gen;
            while (true)
            {
                System.out.print("\nENTER YOUR GENDER (M/F) : ");
                InputStreamReader converter = new InputStreamReader(System.in);
                BufferedReader in = new BufferedReader(converter);
                gen = in.readLine();
                gen = gen.toLowerCase();
                if(gen.equals("m") || gen.equals("f"))
                {
                    in.close();
                    break;
                }
            }
            System.out.println("\nGENDER = "+gen);
        } catch (IOException exc)
        {
            // something, e.g. print stack.
        }