Combining multiple lines

I am fairly new to scripting. But I have been able to extract and format all of my information required into one file. My issue is that one character is on a separate line. I need to be able to add the character to the previous line.

ex.

abcdefghi
1
bcdefghij
3
cdefghijk
4

need to look like

abcdefghi1
bcdefghij3
cdefghijk4

Any help would be appreciated

Thanks

paste -d'\0' - - < myFile

final word. how fun *nix is! i like it.

the normal way is like this :o

sed '$!N;s/\n//'

this cat can be skinned dozen different ways and therefore there's nothing 'final/normal' about this OS

Thanks worked great