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#include <iostream>
using namespace std;

int main()
{
    int count;
    cin >> count; 
    bool one = false, oneone = false;
    while (count--) 
    {
        int next;
        cin >> next;
        if (next == 1) 
        { 
            if (one) { oneone = true; break; } 
            one = true;
        }
    }
    if (!one) {
        cout << "2" << endl << "2" << endl << "1 2";
        return 0;
    }
    
    if (!oneone) {
        cout << "1" << endl << "2" << endl << "1 2";
        return 0;
    }
    cout << "0" << endl << "2" << endl << "1 2";
    return 0;
}