#include <iostream>
#include <algorithm>
using namespace std;
static const int NMAX = 5000;
static const int AMAX = 16384;

int main(){
  int N;
  cin >> N;
  int memo[N + 1][AMAX + 1], A[N];
  for(int i = 0; i < N; i++)
    cin >> A[i];

  for(int i = 0; i <= N; i++){
    for(int j = 0; j <= AMAX; j++){
      memo[i][j] = 0;
    }
  }
  memo[0][0] = 1;

  for(int i = 0; i < N; i++){
    for(int j = 0; j <= AMAX; j++){
      memo[i + 1][(j ^ A[i])] += memo[i][j];
      memo[i + 1][j] += memo[i][j];
    }
  }

  int result = 0;
  for(int i = 0; i <= AMAX; i++){
    if(memo[N][i] > 0){
      cout << i << endl;
      result++;
    }
  }
  cout << result << endl;
}