|> Enum.map(&{Pass.parse_input(&1), Passport.parse_input(&1)})
  |> Enum.map(fn {pass, passport} ->
    {pass, passport, {Pass.valid(pass), Passport.valid(passport)}}
  end)
  |> Enum.filter(fn {pass, passport, {valid_pass, valid_passport}} ->
    valid_pass != valid_passport
  end)

  |> Enum.map(&Passport.parse_input/1)
  |> Enum.filter(&Passport.valid/1)