func main()
	var pos: [][]int :: #[3, 2]int
	for i(0, 2)
		do pos[i] :: [cui@inputInt(), cui@inputInt()]
	end for
	for i(0, 2)
		if(i <> 0)
			do swap(&pos[i], &pos[0])
		end if
		if((pos[1][0] - pos[0][0]) * (pos[2][0] - pos[0][0]) + (pos[1][1] - pos[0][1]) * (pos[2][1] - pos[0][1]) = 0)
			if((pos[1][0] - pos[0][0]) ^ 2 + (pos[1][1] - pos[0][1]) ^ 2 = (pos[2][0] - pos[0][0]) ^ 2 + (pos[2][1] - pos[0][1]) ^ 2)
				do cui@print("\{pos[2][0] + pos[1][0] - pos[0][0]} \{pos[2][1] + pos[1][1] - pos[0][1]}\n")
				ret
			end if
		end if
	end for
	
	do cui@print("-1\n")
	
	func swap(a: &[]int, b: &[]int)
		var t: []int :: ##a
		do a :: ##b
		do b :: ##t
	end func
end func