When doing an integer addition problem, the little sloppy regards the 3 in the tens place as 8, and the 9 in the ones place as 7, and the result is 253. So what is the correct answer?
做一道整数加法题时，小马虎把十位上的3看成8，而把个位上的9看成7，结果得253，那么正确的答案应该是多少？
<gadget id="calculator">253 - 87</gadget>
<output>166</output>

<gadget id="calculator">166 + 39</gadget>
<output>205</output>

<result>205</result>