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#include <bits/stdc++.h>

using namespace std;

int main()
{
	ios_base::sync_with_stdio(false);
	int k,j=0,x;
	cin >> k;
	for (int i=0; i<k; i++)
	{
		cin >> x;
		if (x==1) j++;
	}
	
	if (j==0) cout << 2 << endl;
	else if (j==1) cout << 1 << endl;
	else cout << 0 << endl;
	cout << 2 << endl;
	cout << 1 << " " << 2;
}