How to extract the number from the pattern

Hi
I have a file with the following entries:

cm2363db
cm2445db
cm2618db

Is there a awk or sed command which would allow me to extract only the numbers from this file as output, so the output would look like this:

2363
2445
2618

Thanks a lot -A

echo 'cm2363db' | sed 's/[^0-9]//g'

tr -cd '[[:digit:]]\n' < FILE

or with gnu grep:

grep -oE '[0-9]+' file

That will put each set of numbers on a new line, not what the OP wants.