signature of values ​​when exporting to excel?

I export a 2x3 matrix to Excel, but I need to sign the values

filename = 'L:\DataABC\ABS.xlsx';
A=[2 3]
ABC(:,1) = A';  
B=[4 5]
ABC(:,2) = B'; 
C=[6 7]
ABC(:,3) = C';
xlswrite(filename,ABS)

How to sign values?

Answer 1

[Andrei Bobrov]

A = A'; B = B'; C = C';
writetable(filename,table(A,B,C))