private static String swapCases(String str)
	{
		String cases;
		char c;
		cases = "";
		for(int i = 0; i < str.length(); i++)
		{
			c = str.charAt(i);
			if(Character.isLetter(c))
			{
				if(Character.isUpperCase(c))
				{
					c = Character.toLowerCase(c);
				}
				else
				{
					c = Character.toUpperCase(c);
				}
			}
			cases += c;
		}
		return cases;
	}