Rule 30 by 51b

i;char s[1005];main(){for(gets(s+2);i<2||s[i];)putchar(-(s[i]%2*4|s[++i]&2|s[i+1]%2)&4?35:32);}

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

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