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#include <iostream>

using namespace std;

int main()
{
	ios_base::sync_with_stdio(false);

	int N;
	bool got = false;

	cin >> N;
	for (int i = 0; i < N; i++)
	{
		int a;
		cin >> a;
		if (a == 1) {
			if (!got) {
				got = true;
			} else {
				cout << "0\n2\n1 2\n";
				return 0;
			}
		}
	}

	cout << (got ? "1" : "2") << "\n2\n1 2\n";

	return 0;
}