Converting to a Column Vector

How can I convert the 3-by-3 matrix A into the 3-by-1 matrix B in the simplest way?

A = [ 1 2 3; 4 5 6; 7 8 9 ]

B = [ 123; 456; 789 ]

Answer 1

[Azzi Abdelmalek]

A = [ 1 2 3; 4 5 6; 7 8 9 ]
A*[100;10;1]

Answer 2

[Azzi Abdelmalek]

A = [ 1 2 3; 4 5 6; 7 8 9 ]
B=char(A+'0')

[Rightia Rollmann]

What does '0' do for the function?