#include <bits/stdc++.h>
using namespace std;
int main() {
  int x[5], y[5], k;
  int a[5], b[5];
  for (int i = 0; i < 3; i++) cin >> x[i] >> y[i];
  k = 3;
  cout << k << endl;
  double o1, o2;
  o1 = (x[0] + x[1]) / 2.;
  o2 = (y[0] + y[1]) / 2.;
  a[0] = 2 * o1 - x[2];
  b[0] = 2 * o2 - y[2];
  o1 = (x[0] + x[2]) / 2.;
  o2 = (y[0] + y[2]) / 2.;
  a[1] = 2 * o1 - x[1];
  b[1] = 2 * o2 - y[1];
  o1 = (x[1] + x[2]) / 2.;
  o2 = (y[1] + y[2]) / 2.;
  a[2] = 2 * o1 - x[0];
  b[2] = 2 * o2 - y[0];
  for (int i = 0; i < k; i++) cout << a[i] << " " << b[i] << endl;
  return 0;
}
