if there is a empty line , don't stop your program.

That's real advise!
For the input:
___________
try
#
try try try.

~~~~~~~~~~~

Correct is the output
___________
try try try.

0
~~~~~~~~~~~
as well, so don't bother yourself to avoid the last empty line. Contrary, i've lost a lot of time with it. Stop at EOF, not at double empty line!