How to "end" function definition in SQL plus?

I am using Oracle 11g and SQL plus.
I am trying to define a function and get back to the SQL prompt, but it is just not exiting the function definition.
SQL> create function dept_count (dept_name varchar(20))
2 returns integer
3 begin
4 declare d_count integer;
5 select count (* ) into d_count
6 from instructor
7 where instructor.dept_name = dept_name
8 return d_count;
9 end
10 ;
11
12
13
14
15
16 ;;;
17 end dept_count;
18 ;
19
20 ; <--- I was expecting the SQL> prompt here but it doesn't appear.
What should I do? Please help. Thanks.

And, to answer probably the most frequently asked question when I was an Oracle instructor ...
If you are saving this statement in a file to execute later, after the "/" at the bottom, hit return, so that your file contains a line feed after the /, rather than your file ending with the /
Otherwise you get the annoying, but completely harmless, error message "Input truncated after (number) characters" when you compile the program.

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