#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> P;
const ll MOD = 1e9+7;
const ll INF = 1e18;
#define rep(i,m,n) for(ll i = (m); i <= (n); i++)
#define zep(i,m,n) for(ll i = (m); i < (n); i++)
#define rrep(i,m,n) for(ll i = (m); i >= (n); i--)
#define print(x) cout << (x) << endl;
#define printa(x,m,n) for(int i = (m); i <= n; i++){cout << (x[i]) << " ";} cout<<endl;

int main(){
    cin.tie(0); ios::sync_with_stdio(false);
    
    ll n; cin >> n;
    ll x[n], y[n]; zep(i, 0, n)cin >> x[i] >> y[i];
    
    vector<vector<ll>> v(n);
    zep(i, 0, n)v[i] = {x[i] + y[i], x[i], y[i], i + 1};
    sort(v.begin(), v.end());
    
    bool use[555][555]; memset(use, 0, sizeof(use));
    vector<ll> ans;
    zep(i, 0, n){
    	ll vx = v[i][1], vy = v[i][2];
    	
    	if(!use[vx][vy]){
    		use[vx][vy] = true;
    		ans.push_back(v[i][3]);
    		
    		rep(j, -10, 10){
    			rep(k, -10, 10){
    				if(j * j + k * k < 100){
    					if(1 <= vx + j && vx + j <= 500 && 1 <= vy + k && vy + k <= 500){
    						use[vx + j][vy + k] = true;
    						//cout << j << " " << k << endl;
    					}
    				}
    			}
    		}
    	}
    }
    
    print(ans.size())
    zep(i, 0, ans.size())cout << ans[i] << " "; cout << endl;
    
    return 0;
}