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#include <iostream>
using namespace std;
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n, jed=0;
    cin >> n;
    for (int i=0; i<n; i++)
    {
        int a;
        cin >> a;
        if (a==1)
            jed++;
    }
    cout << max(0, 2-jed) << "\n" << "2\n" << "1 2\n";
}