a=io.read"*a"print((a:gsub("()%.",function(i)s=""for j=i,i+34,17 do s=s..a:sub(j-18,j):sub(1,3)end _,c=s:gsub("%*",0)return c end)))
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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