#!/usr/bin/env ruby

require "matrix"


EPS = 1e-8


def rotation_matrix(angle)
    c = Math.cos angle
    s = Math.sin angle
    m = Matrix[[c, -s, 0], [s, c, 0], [0, 0, 1]]
    return m
end


def translation_matrix(delta)
    m = Matrix[[1, 0, delta[0]], [0, 1, delta[1]], [0, 0, 1]]
    return m
end


def rotate_around(center, point, angle)
    m = translation_matrix(center)
    m *= rotation_matrix(angle)
    m *= translation_matrix([-center[0], -center[1]])
    v = Vector[*point, 1]
    a = m * v
    return Vector[a[0], a[1]]
end


def find_last_point(point1, point2, point3)
    ps = [point1, point2, point3]
    ps.permutation(3) {|p1, p2, p3|
        q3 = rotate_around(p2, p1, Math::PI / 2.0)
            return rotate_around(p3, p2, Math::PI / 2.0) if (p3 - q3).r < EPS
        }
    return nil
end


def main()
    x1, y1, x2, y2, x3, y3 = gets.split.map(&:to_i)
    point1 = Vector[x1, y1]
    point2 = Vector[x2, y2]
    point3 = Vector[x3, y3]
    ans = find_last_point(point1, point2, point3)
    if ans != nil
        puts ans.map(&:round).to_a.join(" ")
    else
        puts (-1)
    end
end


main