#include <bits/stdc++.h>
using namespace std;
const int N = 103;
int a[N];
int n, t;
int main() {
  ios_base::sync_with_stdio(0);
  scanf("%d", &t);
  while (t--) {
    scanf("%d", &n);
    for (int i = 1; i <= n; i++) {
      scanf("%d", &a[i]);
    }
    bool ok = false;
    int i, j;
    for (i = 1; i <= n; i++) {
      int sum = 0;
      for (j = i; j <= n; j++) {
        sum += a[j];
        if (sum % 2 == 0) {
          ok = true;
          break;
        }
      }
      if (ok == true) break;
    }
    if (ok == false) {
      printf("-1\n");
    } else {
      int l = j - i + 1;
      printf("%d\n", l);
      for (int x = i; x <= j; x++) {
        printf("%d ", x);
      }
      printf("\n");
    }
  }
}
