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#include <iostream>

using namespace std;

int main() {
	ios::sync_with_stdio(0);
	int n;
	cin >> n;
	int ones = 0;
	for (int i = 0; i < n; i++)
	{
		int a;
		cin >> a;
		if (a == 1) {
			ones++;
		}
	}
	if (ones ==0)
	{
		cout << "2\n2\n1 2";
		return 0;
	}
	if (ones == 1)
	{
		cout << "1\n2\n1 2";
		return 0;
	}
	else
	{
		cout << "0\n2\n1 2";
		return 0;
	}
}