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#include <iostream>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    int n;
    cin >> n;
    int il1 = 0;
    for (int i = 0; i < n; ++i)
    {
        int s;
        cin >> s;
        if (s == 1)
            ++il1;
    }
    if (il1 >= 2)
        cout << "0";
    if (il1 == 1)
        cout << "1";
    if (il1 == 0)
        cout << "2";
    cout << endl << "2" << endl << "1 2";
    return 0;
}