#line 1 "template/template.hpp"
#include <bits/stdc++.h>

#if __has_include(<atcoder/all>)
#include <atcoder/all>

#endif

using namespace std;

using int64 = long long;

const int64 infll = (1LL << 62) - 1;
const int inf = (1 << 30) - 1;

struct IoSetup {
  IoSetup() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(10);
    cerr << fixed << setprecision(10);
  }
} iosetup;

template <typename T1, typename T2>
ostream& operator<<(ostream& os, const pair<T1, T2>& p) {
  os << p.first << " " << p.second;
  return os;
}

template <typename T1, typename T2>
istream& operator>>(istream& is, pair<T1, T2>& p) {
  is >> p.first >> p.second;
  return is;
}

template <typename T>
ostream& operator<<(ostream& os, const vector<T>& v) {
  for (size_t i = 0; i < v.size(); i++) {
    os << v[i] << (i + 1 != v.size() ? " " : "");
  }
  return os;
}

template <typename T>
istream& operator>>(istream& is, vector<T>& v) {
  for (T& in : v) is >> in;
  return is;
}

template <typename T1, typename T2>
bool chmax(T1& a, T2 b) {
  return a < b && (a = b, true);
}

template <typename T1, typename T2>
bool chmin(T1& a, T2 b) {
  return a > b && (a = b, true);
}

template <typename T = int64>
vector<T> make_v(size_t a) {
  return vector<T>(a);
}

template <typename T, typename... Ts>
auto make_v(size_t a, Ts... ts) {
  return vector<decltype(make_v<T>(ts...))>(a, make_v<T>(ts...));
}

template <typename T, typename V>
enable_if_t<is_class_v<T> == 0> fill_v(T& t, const V& v) {
  t = v;
}

template <typename T, typename V>
enable_if_t<is_class_v<T> != 0> fill_v(T& t, const V& v) {
  for (auto& e : t) fill_v(e, v);
}

template <typename F>
struct FixPoint : F {
  explicit FixPoint(F&& f) : F(std::forward<F>(f)) {}

  template <typename... Args>
  decltype(auto) operator()(Args&&... args) const {
    return F::operator()(*this, std::forward<Args>(args)...);
  }
};

template <typename F>
decltype(auto) MFP(F&& f) {
  return FixPoint<F>{std::forward<F>(f)};
}

int main() {
  vector< pair< int, int > > ps(3);
  cin >> ps;
  auto dist = [](int x, int y, int a, int b) {
    return abs(x - 4 * a) + abs(y - 4 * b);
  };
  auto check = [&](int x, int y) {
    auto a = dist(x, y, ps[0].first, ps[0].second);
    auto b = dist(x, y, ps[1].first, ps[1].second);
    auto c = dist(x, y, ps[2].first, ps[2].second);
    return a == b and b == c;
  };
  vector< pair< int, int > > qs;
  for (int x = -8; x <= 408; x++) {
    for (int y = -8; y <= 408; y++) {
      if (check(x, y)) {
        for (int i = -1; i <= 1; i++) {
          for (int j = -1; j <= 1; j++) {
            if (i == 0 and j == 0) continue;
            if (check(x + i, y + j)) {
              cout << -1 << endl;
              return 0;
            }
          }
        }
        qs.emplace_back(x, y);
      }
    }
  }
  cout << qs.size() << endl;
  for (auto& [x, y]: qs) {
    cout << x / 4.0 << " " << y / 4.0 << endl;
  }
}