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#include <iostream>

using namespace std;

void func1A()
{

	int num = 0;
	int max = 0;
	int count1 = 0;
	int index = 0;
	int curr = 0;

	cin >> num;
	
	while ( num > index )
	{
		cin >> curr;

		if ( curr == 1 )
		{
			count1++;
		}

		index++;
	}

	if ( count1 >= 2)
	{
		cout << 0;
	}
	else if ( count1 == 1)
	{
		cout << 1;
	}
	else
	{
		cout << 2;
	}

	cout << "\n";
	cout << 2;
	cout << "\n";
	cout << "1 2";
	cout << "\n";
}

int main()
{
	func1A();
	return 0;
}