include <bits/stdc++.h>

using namespace std;

#define F first
#define S second
#define what_is(x) cerr << #x << " is " << x << endl

typedef long double ld;
typedef long long ll;

template<typename T> inline void read(T& a) {
    a = 0;
    char c;
    bool _MINUS_ = false;
    while (!isdigit(c = getchar())) _MINUS_ |= c == '-';
    do a = a * 10 + (c - '0');
    while (isdigit(c = getchar()));
    if (_MINUS_) a *= -1;
}

string world[8] = {"U", "D", "R", "L", "UL", "UR", "DR", "DL"};
const int rx[8] = { -1,  1,  0,  0,  -1,  -1,   1,   1};
const int ry[8] = { 0,  0,  1, -1,  -1,   1,   1,  -1};

const long long mod = 1000000007;
const int N = 100100;

map<tuple<ld,ld,ld>,int> mp;

struct point {
    ld x, y;
};

#define FILE "swap"
int main() {
#ifdef LOCAL
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#else
//    freopen(FILE ".in", "r", stdin);    /// files !!!
//    freopen(FILE ".out", "w", stdout);
#endif
    ios_base::sync_with_stdio(0);
    int n;
    cin >> n;
    point p[n];
    for (int i = 0; i < n; i++) {
        cin >> p[i].x >> p[i].y;
    }
    ld aa, bb, cc;
    int ans = -1;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < i; j++) {
            ld a, b, c;
            if (!(p[i].y == p[j].y)) {
                a = 1;
                b = (p[i].x - p[j].x) / (p[j].y - p[i].y);
            } else {
                b = 1;
                a = (p[j].y - p[i].y) / (p[i].x - p[j].x);
            }
            c = -(a * p[i].x + b * p[i].y);
            int cur = ++mp[make_tuple(a, b, c)];
            if (cur >= ans) {
                ans = cur;
                aa = a;
                bb = b;
                cc = c;
            }
        }
    }
    vector<int> res;
    for (int i = 0; i < n; i++) {
        ld w = (ld)(aa) * p[i].x + (ld)(bb) * p[i].y + 1.0 * cc;
        if (abs(w) < 0.000000001) {
            res.push_back(i + 1);
        }
    }
    cout << res.size() << endl;
    for (int i = 0; i < res.size(); i++) {
        cout << res[i] << " ";
    }
#ifdef TIME
    cerr << "TIME = " << 1. * clock() / CLOCKS_PER_SEC;
#endif
    return 0;
}