private static boolean preguntaReintentar( String pregunta)
	{
		char caracter = 0;
		
		do {
			try
			{
				System.out.print( pregunta + " (s/n): ");
				caracter = Character.toLowerCase(scanner.nextLine().charAt(0));
			}
			catch (Exception e)	{}
		} while ((caracter != 's') && (caracter != 'n'));

		return caracter == 's';
	}