Naughty and Xiaoxiao live in the same community. Naughty’s family lives in No. 6, Floor 6, Unit 2, Block A, Happy Garden, and the number is A-2-606. Xiaoxiao’s family lives in No. 9, Floor 3, Unit 4, Block C, and the number is How many.
淘气和笑笑住在同一个小区里，淘气家住在幸福花园的A座2单元6层6号，编号为A-2-606，笑笑家住在C座4单元3层9号，则编号为多少．
<gadget id="calculator">4 - 309</gadget>
<output>-305</output>

<result>-305</result>