#include <bits/stdc++.h>
#define N 1100005
using namespace std;

int n, a[N];

int main() {
	scanf("%d", &n); int m = 1<<n;
	for (int i = 0; i < m; i++) scanf("%d", &a[i]);
	for (int s = 0; s < m; s++) {
		for (int i = 0; i < n; i++) for (int j = 0; j < n; j++) {
			if (a[s|(1<<i)]+a[s|(1<<j)] < a[s]+a[s|(1<<i)|(1<<j)]) {
				printf("%d %d\n", s|(1<<i), s|(1<<j));
				if (n == 12) cout << s << " " << i << " " << j << "?\n";
				return 0;
			}
		}	
	}
	puts("-1");
	return 0;
}