There are 8 students lined up, counting Xiao Ming from left to right ranks fourth, then counting Xiao Ming from right to left.
有8个同学排成一行，从左向右数小明排第4个，那么从右面向左数小明排第多少个．
<gadget id="calculator">8 - 4</gadget>
<output>4</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<result>5</result>