array and pointers

[shoko2004@hotmail.com (shoko)]

hi
i am new in ada
my question is:
i have a function that returns unconstrained array
i am tring to create a pointer to the new array 
could somone help me:

what is wwrong in the following code?:

type Arr is Array(Item range<>) of Integer;
a:Arr:=(1,2,2,2,3,4,3) ; 
type n_array_Ptr is access Arr;
n: n_array_Ptr;

begin
     n:= new Array_filter(a); 
     
     put_line("hello");