#include <cstdio>
#include <iostream>
#include <string>
#include <sstream>
#include <stack>
#include <algorithm>
#include <cmath>
#include <queue>
#include <map>
#include <set>
#include <cstdlib>
#include <bitset>
#include <tuple>
#include <assert.h>
#include <deque>
#include <bitset>
#include <iomanip>
#include <limits>
#include <chrono>
#include <random>
#include <array>
#include <unordered_map>
#include <functional>
#include <complex>
#include <numeric>
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
//constexpr long long MAX = 5100000;
constexpr long long INF = 1LL << 60;
constexpr int inf = 1000000007;
//constexpr long long mod = 1000000007LL;
constexpr long long mod = 998244353LL;
const long double PI = acos((long double)(-1));

using namespace std;
typedef unsigned long long ull;
typedef long long ll;
typedef long double ld;

mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());

int d(int x1, int y1, int x2, int y2) {
    return (x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2);
}
int main()
{
    /*
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    */

    int n; scanf("%d", &n);
    int k = (n + 89) / 90;
    vector<int> x(n), y(n);
    for (int i = 0; i < n; i++) scanf("%d %d", &x[i], &y[i]);
    int idx = min_element(y.begin(), y.end()) - y.begin();
    for (int i = 0; i < n; i++) {
        if (x[i] == x[idx] and y[i] < y[idx]) {
            idx = i;
        }
    }
    vector<int> v;
    for (int i = 0; i < n; i++) if (i != idx) v.emplace_back(i);
    sort(v.begin(), v.end(), [&](int i, int j) {return y[i] < y[j]; });
    reverse(v.begin(), v.end());
    vector<int> res;
    res.emplace_back(idx);
    while (res.size() < k) {
        if (v.empty()){
            assert(false);
        }
        int p = v.back();
        v.pop_back();
        bool ok = true;
        for (auto e : res) {
            int len2 = (x[e] - x[p]) * (x[e] - x[p]) + (y[e] - y[p]) * (y[e] - y[p]);
            if (len2 < 100) {
                ok = false;
                break;
            }
        }
        if (ok) res.emplace_back(p);
    }

    cout << res.size() << "\n";
    for (int i = 0; i < res.size(); i++) cout << res[i] + 1<< " \n"[i + 1 == res.size()];
    return 0;
}