There are 13 chickens lined up, among them there is a big rooster, counting from the front, it stands at the 8th place, how many chickens are there behind it?
13只鸡排成一队，其中有只大公鸡，从前面数，它站在第8，它的后面有几只鸡？
<gadget id="calculator">13 - 8</gadget>
<output>5</output>

<result>5</result>