defmodule Main do
  def input, do: IO.read(:line) |> String.trim
  def ii, do: input() |> String.to_integer
  def li, do: input() |> String.split |> Enum.map(&String.to_integer/1)
  def yn(b), do: IO.puts(if b, do: "Yes", else: "No")

  def main do
    s = input()

    for x <- ["1", "4"] do
      t = String.replace(s, "?", x)
      [a, b, c] = t |> String.split |> Enum.map(&String.to_integer/1)
      if is_kadomatu(a, b, c), do: x, else: ""
    end
    |> Enum.join
    |> IO.puts
  end

  def is_kadomatu(a, b, c) do
    cond do
      a == b or b == c or c == a -> false
      true ->
        [_, x, _] = Enum.sort([a, b, c])
        b != x
    end
  end
end