The sum of a five-digit number and 9 is the smallest five-digit number without repeated numbers, so what is the unit digit of the original five-digit number?
一个五位数与9的和是没有重复数字的最小五位数，则原来五位数的个位数字是什么？
<gadget id="calculator">10_234 - 9</gadget>
<output>10_225</output>

<result>10_225</result>