#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(nullptr);
  int n;
  cin >> n;
  vector<pair<int, int>> p(n);
  for (int i = 0; i < n; i++) {
    cin >> p[i].first >> p[i].second;
    p[i].first += 1e6;
    p[i].second += 1e6;
  }
  while (true) {
    vector<vector<int>> cnt(2, vector<int>(2));
    for (int i = 0; i < n; i++) cnt[p[i].first % 2][p[i].second % 2]++;
    if (cnt[0][0] + cnt[1][1] > 0 && cnt[0][1] + cnt[1][0] > 0) {
      vector<int> A;
      for (int i = 0; i < n; i++)
        if ((p[i].first + p[i].second) % 2 == 0) A.push_back(i);
      cout << A.size() << endl;
      for (auto it : A) cout << it + 1 << ' ';
      return 0;
    }
    if (cnt[0][0] + cnt[0][1] > 0 && cnt[1][1] + cnt[1][0] > 0) {
      vector<int> A;
      for (int i = 0; i < n; i++)
        if (p[i].first % 2 == 0) A.push_back(i);
      cout << A.size() << endl;
      for (auto it : A) cout << it + 1 << ' ';
      return 0;
    }
    int x, y;
    for (int i = 0; i < 2; i++)
      for (int j = 0; j < 2; j++)
        if (cnt[i][j] > 0) {
          x = i;
          y = j;
        }
    for (int i = 0; i < n; i++) {
      p[i].first = (p[i].first - x) / 2;
      p[i].second = (p[i].second - y) / 2;
    }
  }
}
