#include <bits/stdc++.h>
using namespace std;
struct tacka {
  int x, y, ind;
};
int n;
vector<tacka> v;
int ost(int x) {
  x = x % 2;
  if (x < 0) x += 2;
  return x;
}
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  cerr.tie(0);
  cin >> n;
  for (int i = 1; i <= n; i++) {
    tacka t;
    t.ind = i;
    cin >> t.x >> t.y;
    t.x += 1e6;
    t.y += 1e6;
    v.push_back(t);
  }
  if (n == 2) {
    cout << 1 << "\n" << 1;
    return 0;
  }
  while (1) {
    int c1 = 0;
    int c2 = 0;
    int c3 = 0;
    int c4 = 0;
    for (tacka t : v) {
      if (ost(t.x) == 0) {
        if (ost(t.y) == 0)
          c1++;
        else
          c2++;
      } else {
        if (ost(t.y) == 0)
          c3++;
        else
          c4++;
      }
    }
    int cnt = 0;
    if (c1 == 0) cnt++;
    if (c2 == 0) cnt++;
    if (c3 == 0) cnt++;
    if (c4 == 0) cnt++;
    if (cnt == 3) {
      for (tacka& t : v) t.x /= 2, t.y /= 2;
    } else
      break;
  }
  int c1 = 0;
  int c2 = 0;
  int y = -1;
  for (tacka t : v) {
    if (ost(t.x + t.y) == 0)
      c1++;
    else
      c2++;
  }
  if (c1 > 0 && c2 > 0) {
    cout << c1 << "\n";
    for (tacka t : v)
      if (ost(t.x + t.y) == 0) cout << t.ind << ' ';
  } else if (c1 > 0) {
    vector<int> res;
    for (tacka t : v)
      if (ost(t.x) == 0 && ost(t.y) == 0) res.push_back(t.ind);
    cout << res.size() << "\n";
    for (int x : res) cout << x << ' ';
  } else {
    vector<int> res;
    for (tacka t : v)
      if (ost(t.x) == 0 && ost(t.y) == 1) res.push_back(t.ind);
    cout << res.size() << "\n";
    for (int x : res) cout << x << ' ';
  }
  return 0;
}
