Write a PL/SQL code ?

--declare 2 dates of type Date
DECLARE
   start_date Date; 
   end_date Date; 
   sundays_count Number:=0; 
BEGIN
   -- input 2 dates
   start_date:='&input_start_date'; 
   end_date:='&input_end_date';
   /* 
   Returns the date of the first day after the mentioned date 
   and matching the day specified in second parameter.
   */
   start_date:=NEXT_DAY(start_date-1, 'SUNDAY');
   --check the condition of dates by using while loop. 
   while(start_date<=end_date) 
   LOOP 
       sundays_count:=sundays_count+1; 
       start_date:=start_date+7; 
   END LOOP; 
   
   -- print the count of sundays
   dbms_output.put_line('Total number of Sundays between the two dates:'||sundays_count); 
END; 
/