#include <bits/stdc++.h>
using namespace std;
long long x[3], y[3];
vector<pair<int, int> > ve;
int n;
void make(double midx, double midy, int a) {
  long long ansx = midx - (x[a] - midx);
  long long ansy = midy - (y[a] - midy);
  ve.push_back(make_pair(ansx, ansy));
}
int main() {
  for (int i = 0; i < 3; i++) {
    cin >> x[i] >> y[i];
  }
  if ((x[0] - x[1]) * (y[0] - y[2]) == (y[0] - y[1]) * (x[0] - x[2])) {
    cout << 0 << endl;
    return 0;
  }
  make(1.0 * (x[0] + x[1]) / 2, 1.0 * (y[0] + y[1]) / 2, 2);
  make((1.0 * x[0] + x[2]) / 2, 1.0 * (y[0] + y[2]) / 2, 1);
  make(1.0 * (x[2] + x[1]) / 2, 1.0 * (y[2] + y[1]) / 2, 0);
  cout << ve.size() << endl;
  for (int i = 0; i < ve.size(); i++)
    cout << ve[i].first << " " << ve[i].second << endl;
  return 0;
}
