I have two problems:

1) Identify Aut(Aut( ))

I know that Aut( ) is isomorphic to but what about Aut(Aut( ))?

2) Identify Aut G, where G=({1, 3, 5, 7}, ).

{1, 3, 5, 7} are generators of so I'm guessing I should head in that direction, but don't know how.

Please help.