#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, a[15], l = 2000, sum = 0, b[100];
  cin >> n;
  for (int i = 0; i < n; i++) {
    cin >> a[i];
    sum += a[i];
    l = min(l, a[i]);
  }
  int h = sum - l;
  if (h > l) {
    int j = 0, x = 0;
    for (int i = 0; i < n; i++) {
      if (a[i] == l && x == 0) {
        x = 1;
        continue;
      } else if (a[i] == l && x == 1) {
        b[j] = i;
        j++;
      } else {
        b[j] = i;
        j++;
      }
    }
    cout << j << endl;
    for (int i = 0; i < j; i++) {
      cout << b[i] + 1 << " ";
    }
  } else {
    cout << -1;
  }
}
