class Calc0055
  def initialize(args)
    args = args.map { |l| l.chomp.split(/\s+/) }
    @x1, @y1, @x2, @y2, @x3, @y3 = args.shift.map(&:to_i)
  end

  def calc(a, b, c)
    ab = (b[0] - a[0]) ** 2 + (b[1] - a[1]) ** 2
    bc = (c[0] - b[0]) ** 2 + (c[1] - b[1]) ** 2
    ca = (a[0] - c[0]) ** 2 + (a[1] - c[1]) ** 2
    return nil unless ab == bc && 2 * ab == ca

    e = [(c[0] + a[0]) / 2r, (c[1] + a[1]) / 2r]
    be = [e[0] - b[0], e[1] - b[1]]
    d = [b[0] + be[0] * 2, b[1] + be[1] * 2]
    d.map(&:to_i).join(' ')
  end

  def run
    p, q, r = [@x1, @y1], [@x2, @y2], [@x3, @y3]
    [[p, q, r], [r, p, q], [q, r, p]].map do |a, b, c|
      d = calc(a, b, c)
      return d if d
    end
    -1
  end
end

puts Calc0055.new(STDIN.readlines).run if __FILE__ == $0