#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

int N, X[250009], Y[250009];
int col[509][509];
bool used[509][509];
vector<int> ans;

int main() {
	cin >> N;
	for (int i = 1; i <= N; i++) {
		cin >> X[i] >> Y[i]; col[X[i]][Y[i]] = i;
	}
	for (int i = 1; i <= 500; i++) {
		for (int j = 1; j <= 500; j++) {
			if (col[i][j] == 0 || used[i][j] == true) continue;
			ans.push_back(col[i][j]);
			for (int k = -10; k <= 10; k++) {
				for (int l = -10; l <= 10; l++) {
					if (k * k + l * l >= 100) continue;
					int sx = i + k, sy = j + l; if (sx <= 0 || sx > 500 || sy <= 0 || sy > 500) continue;
					used[sx][sy] = true;
				}
			}
		}
	}

	cout << ans.size() << endl;
	for (int i = 0; i < ans.size(); i++) {
		if (i) cout << " "; cout << ans[i];
	}
	cout << endl;
	return 0;
}