12121212 by McBusLuck

s/^/xx\n&/
s/.[58]/xxx&/
s/.8/xxx&/
s/x/01/g
:
y/012345678/123456789/
s/9$/8/
s/6$/5/
s/3$/2/
P
/^\(.\).*\1$/d
b

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

To protect the system from spam, please input your favorite sport (hint: I believe its name must start with 'g', case insensitive)

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