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#include <iostream>

int main()
{
    int n;
    int* v;
    int one_count = 0;

    std::cin >> n;
    v = new int[n];
    for(int i=0;i<n;i++)
    {
        std::cin >> v[i];
        if(v[i]==1)
            one_count++;
    }

    if(one_count==0)
        std::cout << "2\n2\n1 2";
    else if(one_count==1)
        std::cout << "1\n2\n1 2";
    else
        std::cout << "0\n2\n1 2";
    return 0;
}