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#include <iostream>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie();
    int ones_num = 0;
    int n;
    cin >> n;
    for (int i = 0; i < n; i++)
    {
        int a;
        cin >> a;
        if (a == 1)
            ones_num++;
    }
    if (ones_num == 0)
        cout << "2\n2\n1 2";
    else if (ones_num == 1)
        cout << "1\n2\n1 2";
    else
        cout << "0\n2\n1 2";
}