#include <bits/stdc++.h>
using namespace std;
const int N = (int)1e3 + 5;
const int INF = (int)1e9 + 7;
int x[N], y[N];
int n;
map<pair<int, int>, int> id;
vector<pair<int, int> > g[2][2];
int dist(int i, int j) {
  return (x[i] - x[j]) * (x[i] - x[j]) + (y[i] - y[j]) * (y[i] - y[j]);
}
void calc(vector<pair<int, int> > g[2][2]) {
  bool flag = 0;
  int sz00 = (int)g[0][0].size();
  int sz11 = (int)g[1][1].size();
  int sz01 = (int)g[0][1].size();
  int sz10 = (int)g[1][0].size();
  int fx, fy;
  if (sz00 == n) {
    flag = 1, fx = 0, fy = 0;
  }
  if (sz11 == n) {
    flag = 1, fx = 1, fy = 1;
  }
  if (sz01 == n) {
    flag = 1, fx = 0, fy = 1;
  }
  if (sz10 == n) {
    flag = 1, fx = 1, fy = 0;
  }
  if (flag) {
    vector<pair<int, int> > nw[2][2];
    for (auto x : g[fx][fy]) {
      int a = x.first, b = x.second;
      a /= 2, b /= 2;
      id[{a, b}] = id[{x.first, x.second}];
      nw[abs(a) % 2][abs(b) % 2].push_back({a, b});
    }
    calc(nw);
  }
  if (sz00 + sz11 && sz01 + sz10) {
    cout << sz00 + sz11 << endl;
    for (pair<int, int> c : g[0][0]) {
      cout << id[c] << " ";
    }
    for (pair<int, int> c : g[1][1]) {
      cout << id[c] << " ";
    }
    exit(0);
  }
  if (sz00 && sz11) {
    cout << sz00 << endl;
    for (pair<int, int> c : g[0][0]) {
      cout << id[c] << " ";
    }
    exit(0);
  }
  if (sz01 && sz10) {
    cout << sz01 << endl;
    for (pair<int, int> c : g[0][1]) {
      cout << id[c] << " ";
    }
    exit(0);
  }
}
int main() {
  cin >> n;
  for (int i = 1; i <= n; i++) {
    scanf("%d%d", &x[i], &y[i]);
    x[i] += 1e6, y[i] += 1e6;
    g[abs(x[i]) % 2][abs(y[i]) % 2].push_back({x[i], y[i]});
    id[{x[i], y[i]}] = i;
  }
  calc(g);
}
