char=char.encode('GBK')
if char
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"