char=char.encode('GBK')
if charb"\xd7\xf9":
return ""
if char
return "a"
if char
return "b"
if char
return "c"
if char
return "d"
if char
return "e"
if char
return "f"
if char
return "g"
if char
return "h"
if char
return "j"
if char
return "k"
if char
return "l"
if char
return "m"
if char
return "n"
if char
return "o"
if char
return "p"
if char
return "q"
if char
return "r"
if char
return "s"
if char
return "t"
if char
return "w"
if char
return "x"
if char
return "y"
if char
return "z"