How to add zeros column and row at the beginning of matrix

I have A and B

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

if size(B)> size(A) Add zeros column and row at the beginning of matrix A

New_A=[0,0,0,0;0,1,3,5;0,4,6,8;0,9,7,4]

Answer 1

[KSSV]

new_A=zeros(size(B));
new_A(2:end,2:end)=A;