#include <bits/stdc++.h>
using namespace std;
void err(istream_iterator<string> it) {}
template <typename T, typename... Args>
void err(istream_iterator<string> it, T a, Args... args) {
  cerr << *it << " = " << a << '\n';
  err(++it, args...);
}
const long long inf = 1e18L + 5;
const long long mod = 1e9 + 7;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(NULL);
  cout.tie(NULL);
  long long t = 1;
  while (t--) {
    long long n;
    cin >> n;
    std::vector<pair<long long, long long> > p(n);
    std::vector<long long> v;
    for (long long i = 0; i < n; ++i) {
      cin >> p[i].first >> p[i].second;
      p[i].first += 1e6;
      p[i].second += 1e6;
    }
    while (true) {
      bool eveneven = false, oddodd = false, evenodd = false, oddeven = false;
      for (long long i = 0; i < n; ++i) {
        if (p[i].first % 2 == 1 and p[i].second % 2 == 1) {
          oddodd = true;
        }
        if (p[i].first % 2 == 0 and p[i].second % 2 == 0) {
          eveneven = true;
        }
        if (p[i].first % 2 == 0 and p[i].second % 2 == 1) {
          evenodd = true;
        }
        if (p[i].first % 2 == 1 and p[i].second % 2 == 0) {
          oddeven = true;
        }
      }
      if ((eveneven or oddodd) and (oddeven or evenodd)) {
        for (long long i = 0; i < n; ++i) {
          if ((p[i].first + p[i].second) % 2 == 0) {
            v.push_back(i + 1);
          }
        }
        cout << v.size() << '\n';
        for (long long i = 0; i < v.size(); ++i) {
          cout << v[i] << " ";
        }
        cout << '\n';
        return 0;
      }
      if (eveneven and oddodd) {
        for (long long i = 0; i < n; ++i) {
          if (p[i].first % 2 == 0) {
            v.push_back(i + 1);
          }
        }
        cout << v.size() << '\n';
        for (long long i = 0; i < v.size(); ++i) {
          cout << v[i] << " ";
        }
        cout << '\n';
        return 0;
      }
      if (evenodd and oddeven) {
        for (long long i = 0; i < n; ++i) {
          if (p[i].first % 2 == 1) {
            v.push_back(i + 1);
          }
        }
        cout << v.size() << '\n';
        for (long long i = 0; i < v.size(); ++i) {
          cout << v[i] << " ";
        }
        cout << '\n';
        return 0;
      }
      long long x = 0, y = 0;
      if (oddodd or oddeven) {
        x = 1;
      }
      if (evenodd or oddodd) {
        y = 1;
      }
      for (long long i = 0; i < n; ++i) {
        p[i].first -= x;
        p[i].second -= y;
        p[i].first /= 2;
        p[i].second /= 2;
      }
    }
  }
  return 0;
}
