#include <bits/stdc++.h>
using namespace std;
using std::cin;
using std::cout;
int main() {
  float x[3], y[3], midx[3], midy[3], finx[3], finy[3];
  for (int i = 0; i < 3; i++) cin >> x[i] >> y[i];
  midx[0] = (x[0] + x[1]) / 2;
  midy[0] = (y[0] + y[1]) / 2;
  midx[1] = (x[1] + x[2]) / 2;
  midy[1] = (y[1] + y[2]) / 2;
  midx[2] = (x[2] + x[0]) / 2;
  midy[2] = (y[2] + y[0]) / 2;
  finx[0] = 2 * midx[0] - x[2];
  finy[0] = 2 * midy[0] - y[2];
  finx[1] = 2 * midx[1] - x[0];
  finy[1] = 2 * midy[1] - y[0];
  finx[2] = 2 * midx[2] - x[1];
  finy[2] = 2 * midy[2] - y[1];
  cout << 3 << "\n";
  for (int i = 0; i < 3; i++) {
    cout << finx[i] << " " << finy[i] << "\n";
  }
  return 0;
}
