Calculation: 3355+4466+9977-3366-4477-9955.
计算：3355+4466+9977-3366-4477-9955．
<gadget id="calculator">9_977 - 3_366 - 4_477 - 9_955</gadget>
<output>-7_821</output>

<gadget id="calculator">3_355 + 4_466 + (-7_821)</gadget>
<output>0</output>

<result>0</result>