#include <iostream>
#include <set>
using namespace std;
int main(){
	long long n; cin >> n;
	long long p = 1ll<<n;
	multiset<int> s;
	while(p--){ int x; cin >> x; s.insert(x); }
	multiset<int> ans;
	while(n--){
		auto v = *next(s.begin());
		ans.insert(v);
		for(auto x : s){
			auto it = s.find(x+v);
			if(it == s.end()){
				cout << "impossible" << endl;
				return 0;
			}
			s.erase(x+v);
		}
	}
	for(auto x : ans)
		cout << x << endl;
}