It is known that A=12345*98765, B=12344*98766, how much is AB=?
已知A=12345*98765，B=12344*98766，求A-B=多少．
<gadget id="calculator">12_344 * 98_765</gadget>
<output>1_219_155_160</output>

<gadget id="calculator">1_219_155_160 + 12_344</gadget>
<output>1_219_167_504</output>

<gadget id="calculator">98_765 - 1_219_167_504</gadget>
<output>-1_219_068_739</output>

<gadget id="calculator">1_219_155_160 + (-1_219_068_739)</gadget>
<output>86_421</output>

<result>86_421</result>