A city will hold folk culture and art exhibition activities  Xiao Li, Xiao Zhang, Da Wang and Lao Xu will perform live as the successors of paper-cut, Suzhou embroidery, Baiju and Kunqu Opera, each of which will be performed one by one in sequence
The organizers also have the following arrangements: (1) Lao Xu's performance should be arranged behind paper-cut and Su embroidery;(2) Xiao Li can only watch when White Bureau and Kunqu Opera are performed; (3) Wang's performance should be arranged in front of paper-cut; (4) Xiao Zhang's performance should be in front of Kunqu Opera and Lao Xu's show
Lao Xu performed  the white Opera ranked No. 4.