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#include <iostream>
using namespace std;

int main() {
    int top;
    int quantityOf1 = 0;
    int temp;
    cin >> top;
    for (int i=0; i < top; i++){
        cin >> temp;
        if(temp == 1)
            quantityOf1 ++;
    }
    if (quantityOf1 > 1){
        cout << "0" << endl;
    } else if (quantityOf1 == 1){
        cout << "1" << endl;
    } else {
        cout << "2" << endl;
    }
    cout << "2" << endl;
    cout << "1 2";
    return 0;
}