Two different three-digit natural numbers \overline{xOy} and \overline{yOx} have a remainder of 3 when divided by 7, find the sum of \overline{xOy} and \overline{yOx}.
两个不同的三位自然数\overline{xOy}和\overline{yOx}除以7都余3，求\overline{xOy}和\overline{yOx}的和．
<gadget id="calculator">108 + 801</gadget>
<output>909</output>

<result>909</result>