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#include <iostream>

using namespace std;

int main()
{
	int n;
	cin >> ("%d", n);

	int tmp;

	int aa=0;

	for (int i=0; i<n; i++)
	{
        int tmp;
       cin >> ("%d", tmp);
		if (tmp == 1)
            {
                aa++;
            }
	}
	if (aa >= 2)
	{
		printf("0\n2\n1 2\n");
	}
	else if (aa == 1)
	{
		printf("1\n2\n1 2\n");
	}
	else
	{
		printf("2\n2\n1 2\n");
	}
	return 0;
}