alphabet ranges by llhuii(twobit)

import os;a=w=b=c=2;exec'q,w=w,[b,45][c-a==2];a=b;b,c=c,ord(os.read(w!=q<os.write(1,chr(w)),1)or" ");'*999

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

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