Apparently careless in calculating the subtraction, mistaking the subtrahend 587 as 578, the result is 890, what is the correct difference?
明明计算减法时粗心，错把减数587当成578，结果为890，正确的差应是多少？
<gadget id="calculator">578 + 890</gadget>
<output>1_468</output>

<gadget id="calculator">1_468 - 587</gadget>
<output>881</output>

<result>881</result>