Show the command which will write out all lines of text in the edit
buffer which start and end with a nondigit to a file called FOO.

Cheating, sort of - you can call external commands on your data.

If there are no empty lines in your file then excluding lines
with a digit at one end or the other is OK.


1G!Gegrep -v   '^[0-9]|[0-9]$' | tee FOO