If a number, the number obtained after inverting its digits is still this number, we call this number a symmetric number. For example, 22, 353, 1221, 30703, etc. are all symmetrical numbers. How many symmetrical numbers are there in 10-1000?
如果一个数，将它的数字倒排后得的数仍是这个数，我们称这个数为对称数．例如22，353，1221，30703等都是对称数.10-1000中共有多少个对称数．
<gadget id="calculator">9 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10</gadget>
<output>99</output>

<result>99</result>