Xiaohong starts to go to bed at 8:00 in the evening, and wakes up at 5:00 the next day. How many hours does Xiaohong sleep?
小红从晚上8：00开始做睡觉，第二天5：00起床，小红睡了几小时？
<gadget id="calculator">24 - 20</gadget>
<output>4</output>

<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<result>9</result>