Now it is full hour on the clock face, and in another 19 hours, it will be exactly twelve o'clock on the clock face. Question: What time is it on the clock face now?
现在钟面上是整时，再过19小时，钟面上正好是十二时整．请问：现在钟面上是多少时整．
<gadget id="calculator">19 - 12</gadget>
<output>7</output>

<gadget id="calculator">12 - 7</gadget>
<output>5</output>

<result>5</result>