Any algorithm to record user response to visusapatal task?

I need to write a program for that do this task:

The user supposed to connect (1) than (A), (2) then (B), etc.. as shown in

the Image link and I am doing some project planning.

To finish the planning, I have to know which algorithms or techniques that

I will use . Are there any algorithms I can apply?

which programming language is best for this task if I want to make it as a

web app ?