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// ConsoleApplication1.cpp : Defines the entry point for the console application.
//

#include<iostream>

using namespace std;

int main()
{
	std::ios_base::sync_with_stdio(false);
	int n;
	int x;

	cin >> n;

	int counter = 0;

	for (int a = 0; a < n; a++) {
		cin  >> x;

		if (x == 1) {
			counter++;
		}

		if (counter == 2) {
			break;
		}

	}

	if (counter == 2) {
		cout << 0 << endl;
	}
	else if (counter == 1) {
		cout << 1 << endl;
	}
	else {
		cout << 2 << endl;
	}

	cout << "2" << endl;
	cout << "1 2" << endl;
    return 0;
}