#include <iostream>
#include <vector>

using namespace std;

int main() {
	int n;
	cin >> n;
	int m = 1<<n;
	vector<int> b(m);
	int maxb = 0;
	for( int i = 0; i < m; i++ ) {
		cin >> b[i];
		maxb = max(maxb, b[i]);
	}

	vector<int> sums(maxb+1, 0);
	for( int i = 0; i < m; i++ ) {
		sums[b[i]]++;
	}

	sums[0]--;

	bool fine = true;
	int k = -1;
	vector<int> a;
	vector<int> bb(1,0);
	bb.reserve(m);
	while( fine ) {
		k++;
		if( k > maxb )
			break;

		if( sums[k] < 0 ) {
			fine = false;
			break;
		}

		if( sums[k] > 0 ) {
			a.push_back(k);
			int sz = bb.size();
			for( int i = 0; i < sz; i++ ) {
				int val = bb[i] + k;
				if( val > maxb ) {
					fine = false;
					break;
				}
				bb.push_back( val );
				sums[val]--;
				if( sums[val] < 0 ) {
					fine = false;
					break;
				}
			}
			k--;
		}
	}

	if( fine ) {
		for( int x : a )
			cout << x << endl;
	} else
		cout << "impossible" << endl;

	return 0;
}