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#include <bits/stdc++.h>
using namespace std;

int main()
{
	ios_base::sync_with_stdio(0);
	int n;
	cin >> n;
	int ile = 0;
	for(int i = 1; i <= n; i++)
	{
		int a;
		cin >> a;
		if(a == 1) ile++;
	}
	
	int x;
	if(ile == 0) x = 2;
	else if(ile == 1) x = 1;
	else x = 0;
	
	cout << x << "\n";
	cout << "2\n";
	cout << "1 2\n";
	
	return 0;
}