alphabet ranges by twobit

import os
w=b=c=" "
exec'a,b,c=b,c,os.read(0,1)or" ";q,w=w,[b,"-"][ord(c)-ord(a)==2];os.write(1,w*(w!=q));'*999

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

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return top