SED!

HI

Any sed gurus on the list? I use it often in a class I am taking but I
am stuck on this one and have had no luck with the docs I have found.
What I need to do is append 'z=z+' to the beginning of every line in a
file.

The file looks like this:

                 1234960
        1456780
        3456567
        5476865
        456098

thats it 1 simple column! Maybe I need some sleep it is 1 am here in
Germany.

Thanks for any help!
(I know you are out there der hans) :)