Initial Action  

Performed at the beginning of the Graph Grammar.

line 2: Creating the list of inputs.

line 3: Creating the list of outputs.

line 4: Showing an interface for the list of input to the user.

line 5: Creating and initializing a variable for the current input.

Final Action  

Performed at the end of the Graph Grammar.  

There are no need for a final action in that Graph Grammar.