a tab between values

Hi,

I have a file that looks like this:

36-
9+
45-
43+
400-
700+

I want to put a space between the number and the -/+ sign. So the output file will look like this

36 -
9 +
45 -
43 +
400 -
700 +

thanks

One way:

 sed 's/\(.*\)\(.$\)/\1 \2/' file

sed 's/\(.$\)/ \1/' file

sed 's/.$/ &/' file