1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
#include<bits/stdc++.h>
using namespace std;

int main()
{
	ios::sync_with_stdio(0);
	int n, ile=0;
	cin >> n;
	
	for(int i=1; i <= n; ++i)
	{
		int a;
		cin >> a;
		if(a == 1)
			++ile;
	}
	cout << max(0, 2 - ile) << "\n";
	cout << "2\n1 2";
}