Encoder decoder by murky-satyr

r=io.read
f=r()<'e's=r'*a'for i=1,4021,2 do
c=s:sub(i,i)j=4023-i
io.write(f and s:sub(1,1)or c>''and c or s:sub(j,j))s=f and s:sub(2):reverse()or s
end

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

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