How to replace missing values from other variable ?

[chimei0403]

Hi Sas Users,

I need a quick advice.

How should I use the SAS code to replace the value of gender2 to gender variable if the information in gender variable is missing.

Thank you!

data have;
format id $1. gender $1. gender2 $1.;
input @1 ID
@ 3 GENDER
@ 6 GENDER2;
DATALINES;
1 f .
2 . m
3 m .
4 . f
;
run;

[PaigeMiller]

data want;
    set have;
    gender=coalescec(gender,gender2);
run;

[chimei0403]

Thank you soooo much!!