stratum by tabasa

a=io.read()\x0d
a=a..string.reverse(a)\x0d
for i=0,#a/2-1 do\x0d
print(string.sub(a,#a/2-i,#a/2+1+i))\x0d
end

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

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