package main import ( "bufio" "fmt" "os" "sort" "strconv" ) func out(x ...interface{}) { fmt.Println(x...) } var sc = bufio.NewScanner(os.Stdin) func getInt() int { sc.Scan() i, e := strconv.Atoi(sc.Text()) if e != nil { panic(e) } return i } func getInts(N int) []int { ret := make([]int, N) for i := 0; i < N; i++ { ret[i] = getInt() } return ret } func getString() string { sc.Scan() return sc.Text() } // min, max, asub, absなど基本関数 func max(a, b int) int { if a > b { return a } return b } func min(a, b int) int { if a < b { return a } return b } func asub(a, b int) int { if a > b { return a - b } return b - a } func abs(a int) int { if a >= 0 { return a } return -a } func lowerBound(a []int, x int) int { idx := sort.Search(len(a), func(i int) bool { return a[i] >= x }) return idx } func upperBound(a []int, x int) int { idx := sort.Search(len(a), func(i int) bool { return a[i] > x }) return idx } func check(x, y []int, a, b, c int) (int, int) { ax := x[b] - x[a] ay := y[b] - y[a] bx := x[c] - x[a] by := y[c] - y[a] // out(ax, ay, bx, by) if ax*ax+ay*ay == bx*bx+by*by && ax*bx+ay*by == 0 { return x[c] + ax, y[c] + ay } return -1, -1 } func main() { sc.Split(bufio.ScanWords) x := make([]int, 3) y := make([]int, 3) for i := 0; i < 3; i++ { x[i] = getInt() y[i] = getInt() } rx, ry := check(x, y, 0, 1, 2) if rx != -1 { out(rx, ry) return } rx, ry = check(x, y, 1, 0, 2) if rx != -1 { out(rx, ry) return } rx, ry = check(x, y, 2, 0, 1) if rx != -1 { out(rx, ry) return } out(-1) }