There are 4 different numbers that can form a total of 18 different four-digit numbers arranged in a row from small to large, in which the first digit is a perfect square number, and the penultimate four-digit number is also a perfect square number, then What is the sum of these two numbers.
有4个不同的数字共可组成18个不同的四位数由小到大排成一排，其中第一个位数是一个完全平方数，倒数第二个四位数也是完全平方数，那么这两个数的和是多少．
<gadget id="calculator">33 * 33</gadget>
<output>1_089</output>

<gadget id="calculator">99 * 99</gadget>
<output>9_801</output>

<gadget id="calculator">1_089 + 9_801</gadget>
<output>10_890</output>

<result>10_890</result>