class Main
  INF = 2 ** 60

  def start
    aa = f9(input.split.map(&:to_i))
    idx = f8(aa)
    if not idx
      echo(-1)
    else
      echo f7(aa, idx).join(" ")
    end

    self.class.send(:remove_const, :INF)
    return nil
  end

  private

  def f7(aa, idx)
    def f(aa, i, j)
      (aa[i][j] - @o[j])
    end

    @o = aa[idx]
    aa.delete_at(idx)
    x, y = 0, 0
    for i in 0...2
      x += f(aa, i, 0)
      y += f(aa, i, 1)
    end
    @o = nil
    return [x / 2, y / 2]
  end

  def f8(aa)
    def f(b)
      max = -INF
      idx = nil
      for i in 0...b.size
        v = b[i]
        if v > max
          max = v
          idx = i
        end
      end
      return (idx - 1) % b.size
    end

    b = []
    n = aa.size
    for i in 0...n
      x = 0
      for j in 0...2
        x += (aa[(i + 1) % n][j] - aa[i][j]) ** 2
      end
      b += [x]
    end
    return false if b.to_set.size != 2
    return f(b)
  end

  def f9(a)
    aa = []
    while a.size > 0
      t = []
      for _ in 0...2
        t.append a.pop
      end
      aa += [t.reverse]
    end
    aa.reverse
  end

  def echo(x)
    print x
    puts
  end

  def input = gets.chomp
end

Main.new.start