#include <bits/stdc++.h>
using namespace std;
//*/
#include <atcoder/all>
using namespace atcoder;
//*/
#define rep(i,n) for(int i=0;i<n;i++)
#define Rep(i,a,b) for(int i=a;i<b;i++)
#define ALL(x) (x).begin(),(x).end()
#define dbgv(x); for(auto now : x) cout << now << " "; cout << endl;
//using P = pair<int,int>;
using ll = long long;
using ull = unsigned long long;
//*/
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<ll> vll;
typedef vector<int> vint;
random_device rnd;
mt19937 rng(rnd());
using mint = modint998244353;

class Timer {
    public:
        Timer() {
            begin();
            elapsed_time_ = 0.0;
        }

        void begin() {
            start_time_ = chrono::system_clock::now();
        }

        double get_time() {
            chrono::system_clock::time_point end_time = chrono::system_clock::now();
            elapsed_time_ = chrono::duration_cast<std::chrono::nanoseconds>(end_time - start_time_).count();
            elapsed_time_ *= 1e-9; // nanoseconds -> seconds
            return elapsed_time_;
        }

        double get_last_time() const {
            return elapsed_time_;
        }

        bool yet(double time_limit) {
            return get_time() < time_limit;
        }

        double progress(double time_limit) {
            return get_time() / time_limit;
        }

    private:
        chrono::system_clock::time_point start_time_;
        double elapsed_time_;
};
constexpr double time_limit = 1.8;

void solve(){
  Timer timer;
  int n; cin >> n;
  if(n==1){
  	cout << -1 <<endl;
  	return;
  }
  vint a(n); rep(i,n) cin >> a[i];
  vint p(n),q(n); rep(i,n) p[i] = i+1,q[i] = i+1;
  while(timer.yet(time_limit)){
    int i = rng()%n;
    int j = rng()%n;
    while(i==j) j = rng()%n;
    if(((a[i]+p[i])^(a[j]+p[j])) == ((a[i]+p[j])^(a[j]+p[i]))){
      //cout << ((a[i]+p[i])^(a[j]+p[j])) << " " << ((a[i]+p[i])^(a[j]+p[j])) << endl;
      swap(q[i],q[j]);
      dbgv(p);
      dbgv(q);
      return;
    }
  }
  cout << -1 << endl;
}

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int t = 1; //cin >> t;
  rep(dirc,t) solve();
}