What is a statement to get rid of missing values in array output?

[FrustratedBio]

So here is my code. It works for rotating the dataset I need it to, however, I cannot seem to rid myself of the missing values in the output table. My instructor says "do not output an observation if the value is missing." Anyone know how you do that?

libname bst5030 '/folders/myfolders/sasuser.v94/Data for classes 8 to 11 (2)';
data rotate sixmonths_Long (keep= customer_ID Month Sales);
set bst5030.orders_midyear;
array mon[6] Month1-Month6;
do Month=1 to 6;
Sales=mon[Month];
output;
end;
run;

Proc print data=sixmonths_Long;
run;

[Shmuel · Accepted solution]

If not missing(sales) then output;

[FrustratedBio]

Thanks a bunch! I was doing that but I realized that it doesn't work unless I put it BEFORE the statement end.