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#include <iostream>
#define uint unsigned int

using namespace std;

uint n;

int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    cin >> n;
    uint ones = 0;

    for(uint i = 0; i < n; i++)
    {
        uint num;
        cin >> num;

        if(num == 1) ones++;
    }

    if(ones > 2) ones = 2;

    cout << 2 - ones << "\n";
    cout << "2\n";
    cout << "1 2";

    return 0;
}