import math, sequtils, strutils

var x1, x2, x3, y1, y2, y3: float
(x1, y1, x2, y2, x3, y3) = stdin.readLine.split.map parseFloat

proc d(a, b: float): float = sqrt a^2 + b^2

let
  d12 = d(x1 - x2, y1 - y2)
  d13 = d(x1 - x3, y1 - y3)
  d23 = d(x2 - x3, y2 - y3)
  list = [d12, d13, d23]
  maxD = max list

if d13 == maxD:
  swap(x2, x3)
  swap(y2, y3)
if d23 == maxD:
  swap(x1, x3)
  swap(y1, y3)
if x1 > x2:
  swap(x1, x2)
  swap(y1, y2)

let
  dx = (x2 - x1)
  dy = (y2 - y1)
  cx = x1 + dx / 2
  cy = y1 + dy / 2
  xa = cx - dy / 2
  ya = cy + dx / 2
  xb = cx + dy / 2
  yb = cy - dx / 2

if x3 == xa and y3 == ya:
  echo xb.int," ",yb.int
  quit()
if x3 == xb and y3 == yb:
  echo xa.int," ",ya.int
  quit()

echo -1