The sum of the four-digit \overline{abcd} and \overline{cdab} is 3333, and the difference is 693, so what is the four-digit \overline{abcd}?
四位数\overline{abcd}与\overline{cdab}的和为3333，差为693，那么四位数\overline{abcd}为多少．
<gadget id="calculator">3_333 + 693</gadget>
<output>4_026</output>

<gadget id="calculator">4_026 / 2</gadget>
<output>2_013</output>

<result>2_013</result>