2012-2*7*11*13=how much.
2012-2*7*11*13=多少．
<gadget id="calculator">2 * 7 * 11 * 13</gadget>
<output>2_002</output>

<gadget id="calculator">2_012 - 2_002</gadget>
<output>10</output>

<result>10</result>