#include <bits/stdc++.h>
using namespace std;
int main() {
  vector<int> x(3);
  vector<int> y(3);
  for (int i = 0; i < 3; i++) cin >> x[i] >> y[i];
  for (int i = 0; i < 3; i++) {
    int x1 = x[(i + 1) % 3] - x[i];
    int y1 = y[(i + 1) % 3] - y[i];
    int x2 = x[(i + 2) % 3] - x[i];
    int y2 = y[(i + 2) % 3] - y[i];
    int nx1 = x[(i + 2) % 3] + x1;
    int nx2 = x[(i + 1) % 3] + x2;
    int ny1 = y[(i + 2) % 3] + y1;
    int ny2 = y[(i + 1) % 3] + y2;
    if (nx1 == nx2 && ny1 == ny2) {
      x.push_back(nx1);
      y.push_back(ny1);
    }
  }
  cout << x.size() - 3 << endl;
  for (int i = 3; i < x.size(); i++) {
    cout << x[i] << " " << y[i] << endl;
  }
  return 0;
}
