defmodule Main do
  def main do
    1..3
    |> Enum.map(fn _ ->
      IO.read(:line) |> String.trim() |> String.to_integer()
    end)
    |> solve
    |> IO.puts()
  end

  defp solve([a, b, c]) do
    Enum.zip([[:A, :B, :C], [a, b, c]])
    |> List.keysort(1)
    |> Enum.reverse
    |> Enum.map(fn {n, _} -> n |> Atom.to_string end)
    |> Enum.join("\n")
  end
end