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

typedef long long LL;
typedef long double LD;
typedef pair<int, int> PII;
typedef vector<int> VI;
typedef vector<LL> VLL;
#define mp make_pair
#define pb push_back
#define st first
#define nd second

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);

	int n, a;
	int zero = 0;
	int one = 0;

	cin >> n;
	for (int i = 0; i < n; i++) {
		cin >> a;
		if (a == 0) zero++;
		if (a == 1) one++;
	}

	if (one >= 2)
		cout << "0\n2\n1 2";
	else if (one == 1)
		cout << "1\n2\n1 2";
	else
		cout << "2\n2\n1 2";

	return 0;
}