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
    input()
    s = input() |> String.to_charlist

    s
    |> Enum.drop(1)
    |> Enum.drop(-1)
    |> IO.puts
  end
end