81 digit number by tails

s/^/123456789/
:
s/^\(1[^1]*\)[^1].*/\1&\1/
t

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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