#include <bits/stdc++.h>
using namespace std;
int main(){
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  int t;
  cin >> t;
  while(t--){
    int n = 0;
    cin >> n;
    if(n>= 2){
      int par = 0, impar = 0;
      for(int i=0; i < n; i++){
        int num ; 
        cin >> num;
        if(i % 2 == 0){
          if(num % 2 != 0){
            impar++;
          }
        }else{
          if(num % 2 == 0){
            par++;
          }
        }
      }
       cout << par <<" - " << impar << "\n";
    }else{
      cout << "-1" << "\n";
    }
  }
}

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NAo0CjMgMiA3IDYKMwozIDIgNgoxCjcKNwo0IDkgMiAxIDE4IDMgMAo=

4
4
3 2 7 6
3
3 2 6
1
7
7
4 9 2 1 18 3 0