Rot123456789 by leonid (inaniwa)

n=input()
s=''
for x in raw_input():o=ord(x);p=o&97;s+=chr([o,(o-p+n)%26+p][x.isalpha()]^30*(693%o<1))
print s

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

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