#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
template<typename T> inline bool chmax(T &a, T b) { return ((a < b) ? (a = b, true) : (false)); }
template<typename T> inline bool chmin(T &a, T b) { return ((a > b) ? (a = b, true) : (false)); }
#define rep(i, n) for (long long i = 0; i < (long long)(n); i++)
#define rep2(i, m ,n) for (int i = (m); i < (long long)(n); i++)
#define REP(i, n) for (long long i = 1; i < (long long)(n); i++)
typedef long long ll;
#define updiv(N,X) (N + X - 1) / X
#define l(n) n.begin(),n.end()
#define YesNo(Q) Q==1?cout<<"Yes":cout<<"No"
using P = pair<int, int>;
using mint = modint;
const int MOD = 998244353LL;
const ll INF = 999999999999LL;
vector<long long> fact, fact_inv, inv;
/*  init_nCk :二項係数のための前処理
    計算量:O(n)
*/
template <typename T>
void input(vector<T> &v){
 rep(i,v.size()){cin>>v[i];}
  return;
}
void init_nCk(int SIZE) {
    fact.resize(SIZE + 5);
    fact_inv.resize(SIZE + 5);
    inv.resize(SIZE + 5);
    fact[0] = fact[1] = 1;
    fact_inv[0] = fact_inv[1] = 1;
    inv[1] = 1;
    for (int i = 2; i < SIZE + 5; i++) {
        fact[i] = fact[i - 1] * i % MOD;
        inv[i] = MOD - inv[MOD % i] * (MOD / i) % MOD;
        fact_inv[i] = fact_inv[i - 1] * inv[i] % MOD;
    }
}
/*  nCk :MODでの二項係数を求める(前処理 int_nCk が必要)
    計算量:O(1)
*/
long long nCk(int n, int k) {
    assert(!(n < k));
    assert(!(n < 0 || k < 0));
    return fact[n] * (fact_inv[k] * fact_inv[n - k] % MOD) % MOD;
}

long long modpow(long long a, long long n, long long mod) {
    long long res = 1;
    while (n > 0) {
        if (n & 1) res = res * a % mod;
        a = a * a % mod;
        n >>= 1;
    }
    return res;
}

ll POW(ll a,ll n){
  long long res = 1;
    while (n > 0) {
        if (n & 1) res = res * a;
        a = a * a;
        n >>= 1;
    }
    return res;
}
int main() {
  /*int n,m;cin>>n>>m;
  vector<int> v(n);
  rep(i,n){cin>>v[i];}
  vector<vector<int>> w(n);
  rep(i,m){
    int a,b;cin>>a>>b;a--;b--;
    w[a].push_back(b);
    w[b].push_back(a);
  }
  rep(i,(1LL << n)){
    bool d = true;
    rep(j,n){
      int cnt = 0;
      rep(k,w[j].size()){
        if((1LL << w[j][k]) & i){cnt++;}
      }
      if(cnt!=v[j]){d = false;}
    }
    if(d){cout << "Yes" << endl;
      rep(j,n){
        cout << (int)((bool)((1LL << j) & i)) << " ";
      }return 0;
    }
  }
  cout << "No" << endl;
*/
int t;cin>>t;
while(t--){
	ll n;cin>>n;
	int cnt = 0;
	rep(i,31){
		if((1LL << i) & n){cnt++;}
		if(cnt==2){cout << POW(2LL,i+1)-(n%(POW(2LL,i+1))) << endl;cnt++;}
	}
	if(2>cnt){cout << -1 << endl;}
}
}