#include <bits/stdc++.h>
using namespace std;
template <typename tn>
inline tn next(void) {
  tn k;
  cin >> k;
  return k;
}
template <typename tn>
inline ostream& operator<<(ostream& os, const vector<tn>& v) {
  for (int i = 0; (unsigned)i < v.size(); i++) os << v[i] << endl;
  return os;
}
struct point {
  int a[10];
  inline void input(void) {
    for (int i = 0; i < 5; i++) cin >> a[i];
  }
} w[1050];
vector<int> ans;
int main(void) {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int T = next<int>();
  for (int i = 0; i < T; i++) w[i].input();
  for (int i = 0; i < T; i++) {
    bool Break = false;
    for (int j = 0; j < T && !Break; j++)
      for (int k = 0; k < T && !Break; k++) {
        int tmp = 0;
        if (i == j || j == k) continue;
        for (int l = 0; l < 5; l++)
          tmp += (w[j].a[l] - w[i].a[l]) * (w[k].a[l] - w[i].a[l]);
        if (tmp > 0) Break = 1;
      }
    if (!Break) ans.push_back(i + 1);
  }
  cout << ans.size() << endl << ans;
  return ~~(0 - 0);
}
