pos = gets.strip.split(' ').map(&:to_i)
x1 = pos[0]
y1 = pos[1]
x2 = pos[2]
y2 = pos[3]
x3 = pos[4]
y3 = pos[5]


def dis2(pos1, pos2)
	(pos1[0] - pos2[0]) ** 2 + (pos1[1] - pos2[1]) ** 2
end

def scalar(x1, y1, x2, y2, x3, y3)
	(x2 - x1) * (x3 - x1) + (y2 - y1) * (y3 - y1)
end


dis12 = dis2([x1, y1], [x2, y2])
#p dis12
dis23 = dis2([x2, y2], [x3, y3])
#p dis23
dis31 = dis2([x3, y3], [x1, y1])
#p dis31

if dis12 == dis23 && dis23 == dis31
	puts "-1"
	exit
end
if dis12 != dis23 && dis23 != dis31 && dis31 != dis12
	puts "-1"
	exit
end

if dis23 == dis31
	x1, x2, x3 = x2, x3, x1
	y1, y2, y3 = y2, y3, y1
end
if dis31 == dis12
	x1, x2, x3 = x3, x1, x2
	y1, y2, y3 = y3, y1, y2
end
if scalar(x2, y2, x1, y1, x3, y3) == 0
	x4 = x1 + (x3 - x2)
	y4 = y1 + (y3 - y2)
	print "#{x4} #{y4}\n"
else
	puts "-1"
end