#include <bits/stdc++.h>
using namespace std;

using ll = long long;
using pii = pair<int, int>;
template <class T>
using V = vector<T>;
template <class T>
using VV = V<V<T>>;

#define pb push_back
#define eb emplace_back
#define mp make_pair
#define fi first
#define se second
#define rep(i, n) rep2(i, 0, n)
#define rep2(i, m, n) for (int i = m; i < (n); i++)
#define per(i, b) per2(i, 0, b)
#define per2(i, a, b) for (int i = int(b) - 1; i >= int(a); i--)
#define ALL(c) (c).begin(), (c).end()

constexpr ll TEN(int n) { return (n == 0) ? 1 : 10 * TEN(n - 1); }

template <class T, class U>
void chmin(T& t, const U& u) {
    if (t > u) t = u;
}
template <class T, class U>
void chmax(T& t, const U& u) {
    if (t < u) t = u;
}

template <class T, class U>
ostream& operator<<(ostream& os, const pair<T, U>& p) {
    os << "(" << p.first << "," << p.second << ")";
    return os;
}

template <class T>
ostream& operator<<(ostream& os, const vector<T>& v) {
    os << "{";
    rep(i, v.size()) {
        if (i) os << ",";
        os << v[i];
    }
    os << "}";
    return os;
}

#ifdef LOCAL
void debug_out() { cerr << endl; }
template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
    cerr << " " << H;
    debug_out(T...);
}
#define debug(...) \
    cerr << __LINE__ << " [" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#define dump(x) cerr << __LINE__ << " " << #x << " = " << (x) << endl
#else
#define debug(...) (void(0))
#define dump(x) (void(0))
#endif

bool ng[510][510];
int id[510][510];

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    memset(id, -1, sizeof(id));

    int N;
    cin >> N;
    rep(i, N) {
        int x, y;
        cin >> x >> y;
        --x, --y;
        id[x][y] = i;
    }

    V<int> vec;
    rep(x, 500) {
        rep(y, 500) {
            if (id[x][y] != -1 && !ng[x][y]) {
                vec.pb(id[x][y]);
                for (int nx = x; nx < x + 10; ++nx) {
                    for (int ny = y - 9; ny <= y + 9; ++ny) {
                        int sq = (x - nx) * (x - nx) + (y - ny) * (y - ny);
                        if (sq < 100 && nx >= 0 && nx < 500 && ny >= 0 &&
                            ny < 500) {
                            ng[nx][ny] = 1;
                        }
                    }
                }
            }
        }
    }

    cout << vec.size() << endl;
    for (int x : vec) cout << x + 1 << " ";
    cout << endl;

    return 0;
}