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#include <iostream>
using namespace std;
int n,x,w;
int main()
{
    cin.tie(0);
    cout.tie(0);
    ios_base::sync_with_stdio(0);
    cin >> n;
    for (int i=0;i<n;++i)
    {
        cin >> x;
        if (x==1) w++;
    }
    if (w==0)       cout << 2 << "\n";
    else if (w==1)  cout << 1 << "\n";
    else            cout << 0 << "\n";
    cout << "2\n1 2";
    return 0;
}