c;main(i){for(i=abs(atoi(gets(&i))-26);~scanf("%c",&c);putchar(isalpha(c)?c+i>((c&32)+90)?c+i-26:c+i:c==33|c==63?c^30:c));}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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