How to swap elements of the first column of the S matrix with the first line elements?

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Hi I have a matrix
A=[1 2 3;
4 5 6;
7 8 9]
but I want to switch the first column with first line like this
A=[1 4 7;
2 5 6;
3 8 9].
What it's the fast way to do it? Any help is appreciated! Thank you

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