When Xiaoqiao was doing a subtraction problem, due to her carelessness, she regarded the 5 in the units place of the subtrahend as 9, and the 8 in the tens place as 3, and the result was a difference of 123. What is the correct answer?
小巧在做一道减法计算题时，由于粗心，将减数个位上的5看作9，把十位上的8看作3，结果所得的差是123，正确答案是几？
<gadget id="calculator">39 - 85</gadget>
<output>-46</output>

<gadget id="calculator">123 + (-46)</gadget>
<output>77</output>

<result>77</result>