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#include <bits/stdc++.h>
using namespace std;
int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int n;
	cin >> n;
	vector<int> arr(n);
	for (int i = 0; i < n; i++) cin >> arr[i];
	sort(arr.begin(), arr.end());
	int x = 0;
	if (arr[0] > 1) x++;
	if (arr[1] > 1) x++;
	cout << x << endl << 2 << endl << "1 2" << endl;
    return 0;
}