#include <bits/stdc++.h>
using namespace std;
void debug_out() { cerr << '\n'; }
template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
  cerr << " " << H;
  debug_out(T...);
}
const int DMAX = 2e5 + 10;
struct nume {
  int x, y;
};
inline bool operator<(nume x, nume y) { return x.x < y.x; }
set<pair<int, int> > ans;
nume V[DMAX];
int n;
void solve(int st, int dr);
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  int t, i, j;
  cin >> n;
  for (i = 1; i <= n; i++) {
    cin >> V[i].x >> V[i].y;
    ans.insert({V[i].x, V[i].y});
  }
  sort(V + 1, V + n + 1);
  solve(1, n);
  cout << ans.size() << '\n';
  for (auto& it : ans) cout << it.first << ' ' << it.second << '\n';
  return 0;
}
void solve(int st, int dr) {
  if (st == dr) return;
  int mij = (st + dr) / 2;
  solve(st, mij);
  solve(mij + 1, dr);
  for (int i = st; i <= dr; i++) ans.insert({V[mij].x, V[i].y});
}
