Mingming is a years old this year, Honghong is 2 years older than Mingming this year, how old will Honghong be a+ next year.
明明今年a岁，红红今年比明明大2岁，红红明年a+多少岁．
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<result>3</result>