#include <bits/stdc++.h>   using namespace std;   int main() {     int t;     cin >> t;     while (t--) {       int n;       cin >> n;       int a[n], odd = 0, evenindex;       for (int i = 0; i < n; i++) {         cin >> a[i];         if (a[i] % 2 == 1) odd++;         if (a[i] % 2 == 0) evenindex = i + 1;       }       if (n == 1 && a[0] % 2 == 1)         cout << -1 << endl;       else if (odd == n)         cout <<  2 n1 2 n ;       else         cout <<  1 n  << evenindex << endl;     }     return 0;   }   