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a[[0]] equivalent to a[[-1]] and so forth


Dear Group,
I have a simple issue:
If  I have a list such as :
a = {4, 5, 6};
How can I do this in an elegant way:
a[[0]] equivalent to a[[-1]]
a[[-1]] equivalent to a[[-2]]
and so forth.

I thought of a[[If[i <=0, i - 1, i]]] would solve the problem
but I want a more elegant way of doing this.

Any help is very welcome,
Thanks,
Alex



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