A[2013],n;main(i){gets(A);for(;i++<2012||putchar(A[++n]);A[n?:1&A[0]?i%2?2012-i/2:i/2:i<1008?2*i-3:4026-2*i]=getchar());}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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