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#include <iostream>

using namespace std;

int main()
{
    int ilosc;
    int val;
    int ileTakich = 0;
    cin >> ilosc;
    for(int i = 0; i < ilosc; i++)
    {
        cin >> val;
        if(val == 1)
        {
            ileTakich++;
        }
    }
    cout << 2 - min(ileTakich, 2) << endl;
    cout << 2 << endl;
    cout << "1 2" << endl;
    return 0;
}