VimGolf prepend * to every non-blank line

5e4dfcccaa2db400090b66c3

Prepend an asterisk to every non-blank line in the input file.

Start file

This is a
very short

file, but it is 
still
full

of

surpises.

End file

*This is a
*very short

*file, but it is 
*still
*full

*of

*surpises.

Here are your keystrokes:

<C-V>10jI*<Esc><Esc>2jx4jx2jx:wq!<CR>