ISBN2 by kt3k

while 1:a=raw_input();i=0;exec"z=a.replace('?',`i`);i+=sum(ord(x)%30*(2+c*90-c%2*66)for c,x in enumerate(z[4:]))%(len(z)^5)>0;"*10;print z

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

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