Xiao Wang is the last stick. The order of Xiao Li, Xiao Zhang and Xiao Zhao may be:

Xiao Li, Xiao Zhang, Xiao Zhao;

Xiao Li, Xiao Zhao and Xiao Zhang;

Xiao Zhang, Xiao Li, Xiao Zhao;

Xiao Zhang, Xiao Zhao, Xiao Li;

Xiao Zhao, Xiao Li and Xiao Zhang;

Xiao Zhao, Xiao Zhang, Xiao Li;

* * * There are six different arrangements.

So the answer is: 6.