#include <bits/stdc++.h>
using namespace std;
long long INF = 1e9 + 7;
long long MOD = 998244353;
int main(void) {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  long long n;
  cin >> n;
  long long x[n], y[n];
  if (n == 2) {
    cout << "1 1\n";
    return 0;
  }
  vector<long long> group[2][2];
  for (long long i = 0; i < n; i++) {
    cin >> x[i] >> y[i];
    x[i] += 1000000;
    y[i] += 1000000;
    group[0][0].push_back(i + 1);
  }
  while (max({group[0][0].size(), group[0][1].size(), group[1][1].size(),
              group[1][0].size()}) == n) {
    group[0][0].clear();
    group[1][1].clear();
    group[0][1].clear();
    group[1][0].clear();
    for (long long i = 0; i < n; i++) {
      group[abs(x[i]) % 2][abs(y[i]) % 2].push_back(i + 1);
      x[i] /= 2;
      y[i] /= 2;
    }
  }
  vector<pair<int, int> > poia;
  bool ok = 1;
  for (long long i = 0; i < 2; i++) {
    for (long long j = 0; j < 2; j++) {
      if (!group[i][j].empty()) {
        poia.push_back(pair<int, int>(i, j));
      } else if ((i + j) % 2 == 0) {
        ok = 0;
      }
    }
  }
  if (poia.size() == 2) {
    cout << group[poia[0].first][poia[0].second].size() << endl;
    for (auto x : group[poia[0].first][poia[0].second]) {
      cout << x << " ";
    }
  } else if (poia.size() == 4 || (poia.size() == 3 && ok)) {
    cout << group[0][0].size() + group[1][1].size() << endl;
    for (auto x : group[0][0]) {
      cout << x << " ";
    }
    for (auto x : group[1][1]) {
      cout << x << " ";
    }
  } else {
    cout << group[0][1].size() + group[1][0].size() << endl;
    for (auto x : group[0][1]) {
      cout << x << " ";
    }
    for (auto x : group[1][0]) {
      cout << x << " ";
    }
  }
}
