Mark the order of locations using plot3

Hi,

i made the following Script:

A=[10 20 30 40]
B=[40 50 60]'
M=[1 4 3 74; 5 56 17 38; 90 1 11 49]
N=[11 62 13 14; 15 36 17 18; 15 20 31 2]
O=[82 32 4 61; 5 20 37 71; 39 69 36 22]

 figure;
hold;
grid on;
xlabel('M');
ylabel('N');
zlabel('O');

 for i = 1:length(B)

    plot3(M(i,:), N(i,:), O(i,:),'o','DisplayName',sprintf('B=%i',B(i))); 
    view(40,35)

 end

 legend('show');

everything is fine,i can distinguish the B-values of each respective entry by different colors and a legend. But how can i mark the A-values of each location? The first blue dot has to be additionally related to A1, the second blue dot to A2 and so on... Clicking the dots in the figure only displays the values M,N and O. Is there a way to add an A to identify the line? I hope i could express myself sufficiently, please let me know if you need further informations...