An ant climbs from 19 centimeters to 8 centimeters, how many centimeters does the ant climb?
一只蚂蚁从19厘米处爬到8厘米的地方，这只蚂蚁爬了多少厘米．
<gadget id="calculator">19 - 8</gadget>
<output>11</output>

<result>11</result>