[PyMOL] selection disordered

[Frank D. <fra...@bi...>]

Hi there,

i have the following problem: selecting all ca atoms in chain A of 1ao0 
the amino acids in the selection are disordered with respect to their 
occurrence in the protein.

After loading the protein i tried the following:

    numbers=[]
    iterate (chain a)&(name ca),(numbers.append(resi))
    print numbers

And what i get is the following:

    ['56', '1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', 
'12', '13', '14', '15', '16', '17', '18', '19', '20', '21', '22', '23', 
'24', '25', '26', '27','28', '29', '30', '31', '32', '33', '34', '35', 
'36', '37', '38', '39', '40', '41', '42', '43', '44', '45', '46', '47', 
'48', '49', '50', '51', '52', '53', '54', '55', '57', '58', '59', '60', 
'61', ...]

So the 56th amino acid is BEFORE the first one. Whats going wrong?

    Thanks:

       Frank