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module T2762A (input) where
class InputOutput a where
input :: String -> (a, String)
instance InputOutput Char where
input (x : bs) = (x, bs)
instance InputOutput a => InputOutput [a] where
input ('0':bs) = ([], bs)
input ('1':bs) = case input bs of
(x, bs') ->
case input bs' of
~(xs, bs'') -> (x : xs, bs'')
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