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#include <iostream>

using namespace std;

int main() {
	int n;

	cin >> n;

	int ones = 0;

	for (int i = 0; i < n; ++i) {
		int a;

		cin >> a;

		if (a == 1) {
			if (++ones > 1) {
				break;
			}
		}
	}

	cout << 2 - ones << endl;
	cout << 2 << endl;
	cout << "1 2" << endl;

	return 0;
}