selecting desired row

2012 1 18
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I have 2 matrix
A=[10 50 69
8 9 10;
79 52 63]
B=[5; 79;7 ]
now i want to dispaly row A corresponding to B (i.e)i want to comapare 1st columns of A and B,i want to display which is present in both A and B(1st column)...
in this A and B only 79 is present so i wnat to dispaly as
79 52 63
i have 1000x6 matrices

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