for(i,0,-1+b:=(a:=File standardInput readLine)size,if(i==c:=b/2-.5,a," "repeated(b)atPut(i,d:=a at(i))atPut(c,d)atPut(b-i-1,d))println)
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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