There are 185 folk story books, 210 fairy tale books, and 335 children's novels. How many more children's novels than fairy tale books.
民间故事书有185本、童话书有210本、儿童小说有335本．儿童小说比童话书多多少本．
<gadget id="calculator">335 - 210</gadget>
<output>125</output>

<result>125</result>