How to avoid directory listing in laravel 4 -

i new laravel4, trying run laravel4 on shared hosting.since dont have root access, avoid public in url. have moved contents in public directory "public_html" folder.

then changed locations in respective files. when visited url "abc.com/myapp/app", lists folders , files under app directory. since exposes project files, looking avoid same.

in codeigniter if try access folders gives message

"directory access forbidden."

edit:

i have added

options followsymlinks multiviews -indexes

in .htaccess file in app folder per suggested @valey viktorovsky

there multiple methods...

the easy one:
if have access .htaccess file , can modify it, place little code

options -indexes   

annoying one
if cannot create/modify .htaccess file, create index.html file inside each folder protect