defmodule Main do
  def main do
    1..2
    |> Enum.map(fn _ ->
      IO.read(:line)
      |> String.trim()
      |> String.to_charlist()
      |> Enum.sort()
    end)
    |> solve
    |> IO.puts()
  end

  defp solve([a, b]) do
    cond do
      a == b -> "YES"
      true -> "NO"
    end
  end
end