18 students were photographed running in a row. Counting from front to back, Liangliang ranked 8th, and counting from back to front, Congcong ranked 6th. How many classmates are there between Liangliang and Congcong?
18名同学拍成一排跑步，从前往后数，亮亮排第8，从后往前数，聪聪排第6，亮亮和聪聪之间有几名同学？
<gadget id="calculator">18 - 8 - 6</gadget>
<output>4</output>

<result>4</result>