#include <bits/stdc++.h>
using namespace std;

const long long M = (long long)1e17 * 5;

long long Calc(long long A, long long B, long long C, long long D) {
  long long AvgA = (A + C) / 2;
  long long AvgB = (B + D) / 2;
  long long ErrorA = abs(M - AvgA);
  long long ErrorB = abs(M - AvgB);

  return ErrorA + ErrorB;
}

int main() {
	int N; cin >> N;
  vector<long long> A(59), B(59);
	for (int i = 1; i <= N; i++) cin >> A[i] >> B[i];

	cout << 50 << endl;
	for (int i = 1; i <= 50; i++) {
    pair<long long, int> Best = {1e18, 0};

    for (int j = 2; j <= N; j++) {
      long long E = Calc(A[1], B[1], A[j], B[j]);
      if (Best.first > E) {
        Best.first = E;
        Best.second = j;
      }
    }

    A[1] = (A[1] + A[Best.second]) / 2;
    B[1] = (B[1] + B[Best.second]) / 2;
    A[Best.second] = A[1];
    B[Best.second] = B[1];
    cout << 1 << ' ' << Best.second << endl;
	}
}