567*789789-789*567567．
567*789789-789*567567．
<gadget id="calculator">567 * 789_789</gadget>
<output>447_810_363</output>

<gadget id="calculator">789 * 567_567</gadget>
<output>447_810_363</output>

<gadget id="calculator">447_810_363 - 447_810_363</gadget>
<output>0</output>

<result>0</result>