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

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