When Xiaogang was doing a subtraction problem, he wrote the subtrahend 39 as 93 by mistake. The difference he got at this time was 354. What is the correct difference?
小刚在做一道减法题时，把减数39错写成93，这时得到的差是354，正确的差是多少．
<gadget id="calculator">93 - 39</gadget>
<output>54</output>

<gadget id="calculator">354 + 54</gadget>
<output>408</output>

<result>408</result>