#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using II = pair<long long, long long>;
using VII = vector<II>;
using VVII = vector<VII>;
using VI = vector<long long>;
using VVI = vector<VI>;
using VVVI = vector<VVI>;
template <class T = long long>
inline bool chmax(T& a, const T& b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
}
template <class T = long long>
inline bool chmin(T& a, const T& b) {
  if (a > b) {
    a = b;
    return true;
  }
  return false;
}
template <class T>
ostream& operator<<(ostream& s, const vector<T>& d) {
  for (long long i = 0, max_i = (d.size()); i < max_i; i++)
    s << d[i] << (i == d.size() - 1 ? "" : " ");
  return s;
}
template <class T>
ostream& operator<<(ostream& s, const vector<vector<T>>& d) {
  for (long long i = 0, max_i = (d.size()); i < max_i; i++)
    s << d[i] << (i == d.size() - 1 ? "" : "\n");
  return s;
}
template <class T, class S>
ostream& operator<<(ostream& s, const pair<T, S>& p) {
  s << "{" << p.first << ", " << p.second << "}";
  return s;
}
template <class T, class S>
ostream& operator<<(ostream& s, const map<T, S> m) {
  for (pair<T, S> p : m) s << p << endl;
  return s;
}
void dump_func() { cerr << endl; }
template <class Head, class... Tail>
void dump_func(Head&& h, Tail&&... t) {
  cerr << h << (sizeof...(Tail) == 0 ? "" : ", "),
      dump_func(forward<Tail>(t)...);
}
struct Fast {
  Fast() {
    cin.tie(0);
    ios::sync_with_stdio(false);
  }
} fast;
constexpr long long MOD = 1e9 + 7;
signed main() {
  vector<vector<bool>> t(1001, vector<bool>(1001));
  VII ps(3);
  for (long long i = 0, max_i = (3); i < max_i; i++) {
    cin >> ps[i].first >> ps[i].second;
  }
  sort((ps).begin(), (ps).end());
  for (long long x = (ps[0].first), max_i = (ps[1].first + 1); x < max_i; x++) {
    t[x][ps[0].second] = true;
  }
  long long mi = min(ps[0].second, ps[1].second);
  long long ma = max(ps[0].second, ps[1].second);
  for (long long y = (mi), max_i = (ma + 1); y < max_i; y++) {
    t[ps[1].first][y] = true;
  }
  mi = min(ps[1].second, ps[2].second);
  ma = max(ps[1].second, ps[2].second);
  for (long long y = (mi), max_i = (ma + 1); y < max_i; y++) {
    t[ps[1].first][y] = true;
  }
  for (long long x = (ps[1].first), max_i = (ps[2].first + 1); x < max_i; x++) {
    t[x][ps[2].second] = true;
  }
  long long cnt = 0;
  for (long long i = 0, max_i = (1001); i < max_i; i++) {
    for (long long j = 0, max_i = (1001); j < max_i; j++) {
      cnt += t[i][j];
    }
  }
  cout << cnt << endl;
  for (long long i = 0, max_i = (1001); i < max_i; i++) {
    for (long long j = 0, max_i = (1001); j < max_i; j++) {
      if (t[i][j]) {
        cout << i << ' ' << j << endl;
      }
    }
  }
}
