There are four different numbers between 1000 and 9999, and the difference between the ones digit and the thousands digit (the number reduced by a large number) is 2. How many such integers are there?
在1000和9999之间由四个不同的数字组成，而且个位数和千位数的差(大数减小数)是2，这样的整数共有多少个．
<gadget id="calculator">8 * 8 * 7</gadget>
<output>448</output>

<gadget id="calculator">7 * 8 * 7</gadget>
<output>392</output>

<gadget id="calculator">448 + 392</gadget>
<output>840</output>

<result>840</result>