#include <bits/stdc++.h>
int read() {
  int x = 0, flag = 1;
  char c;
  while ((c = getchar()) < '0' || c > '9')
    if (c == '-') flag = -1;
  while (c >= '0' && c <= '9')
    x = (x << 3) + (x << 1) + (c ^ 48), c = getchar();
  return x * flag;
}
int n, m, a[1005][6], b[1005];
int main() {
  n = read();
  for (int i = 1; i <= n; i++)
    for (int j = 1; j <= 5; j++) a[i][j] = read();
  for (int i = 1; i <= n; i++) {
    for (int j = 1; j <= n; j++)
      for (int k = 1; k <= n; k++) {
        if (i == j || i == k || j == k) continue;
        int s = 0;
        for (int l = 1; l <= 5; l++)
          s += (a[j][l] - a[i][l]) * (a[k][l] - a[i][l]);
        if (s > 0) goto In;
      }
    b[++m] = i;
  In:;
  }
  printf("%d\n", m);
  for (int i = 1; i <= m; i++) printf("%d\n", b[i]);
}
