how to get the output like this

[Aayushi_17]

Hi how to get the desired output if we have input like this shown below

Input

walking_stick, aids_used_for_dressing

walking_frame, other

reaching, shopping_and_housework

rising, walking

reaching, gripping_and_opening_things, shopping_and_housework

reaching, gripping_and_opening_things

raised_toilet_seat, jar_opener_for_jars_previously_opened, bath_rail, long_handled_appliances_in_bathroom

output like this :

Output

walking_stick

aids_used_for_dressing

walking_frame

other

reaching

shopping_and_housework

rising

walking

reaching

gripping_and_opening_things

shopping_and_housework

reaching

gripping_and_opening_things

raised_toilet_seat

jar_opener_for_jars_previously_opened

bath_rail

long_handled_appliances_in_bathroom

by separating values with comma

[PeterClemmensen]

Try this

data have;
input string $ 1-200;
infile datalines truncover;
datalines;
walking_stick, aids_used_for_dressing                                                                     
walking_frame, other                                                                                      
reaching, shopping_and_housework                                                                          
rising, walking                                                                                           
reaching, gripping_and_opening_things, shopping_and_housework                                             
reaching, gripping_and_opening_things                                                                     
raised_toilet_seat, jar_opener_for_jars_previously_opened, bath_rail, long_handled_appliances_in_bathroom 
;

data want(keep = w);
   set have;

   do i = 1 to countw(string, ', ');
      w = scan(string, i, ', ');
      output;
   end;
run;

[Phil_NZ]

You can follow the code given by @PeterClemmensen 

Just another document you can give it a go about your issue ( https://blogs.sas.com/content/iml/2016/07/11/break-sentence-into-words-sas.html#:~:text=The%20COUNTW....)

You will see the solution for a more comprehensive question relating to your issue.

Cheers.