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#include <iostream>

int n;

int main()
{
    std::cin >> n;
    int ones = 0;
    for (int i=0;i<n;++i)
    {
        int K;
        std::cin >> K;
        if (K == 1) ones++;
    }

    int result = 0;
    if (ones >= 2) result = 0;
    else if (ones == 1) result = 1;
    else result = 2;

    std::cout << result << std::endl;
    std::cout << 2 << std::endl;
    std::cout << "1 2" << std::endl;
    return 0;
}