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