#include<bits/stdc++.h>
using namespace std;
#define int long long
#define ii pair <int, int>
#define app push_back
#define all(a) a.begin(), a.end()
#define bp __builtin_popcountll
#define ll long long
#define mp make_pair
#define f first
#define s second
#define Time (double)clock()/CLOCKS_PER_SEC
#define debug(x) std::cout << #x << ": " << x << '\n';
signed main() {
    #ifdef HOME
    freopen("input.txt", "r", stdin);
    #else
    #define endl '\n'
    ios_base::sync_with_stdio(0); cin.tie(0);
    #endif

    int n;
    cin >> n;

    map <int, int> dx, dy;
    vector <ii> a(n);
    for (int i = 0; i < n; ++i) {
        cin >> a[i].f >> a[i].s;

        ++dx[a[i].f%8];
        ++dy[a[i].s%8];

    }   

    int bestx = 0, besty = 0;
    for (auto e : dx)
        if (e.s > dx[bestx])
            bestx = e.f;

    for (auto e : dy)
        if (e.s > dy[besty])
            besty = e.f;

    vector <int> ans;
    for (int i = 0; i < n; ++i) {
        if (a[i].f % 8 == bestx && a[i].s%8 == besty) {
            ans.app(i);
        }   
    }   
    cout << ans.size() << endl;
    for (auto e : ans)
        cout  << e +  1<< ' ';
    cout << endl;
}