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#include <iostream>
using namespace std;

int main () {
    int a;
    cin >> a;
    int ilosc1=0;
    int tmp;
    for (int i=0; i<a; i++) {
        cin >> tmp;
        if (tmp==1) ilosc1++;
    }
    if (ilosc1>=2) {
        cout << 0 << endl << 2 << endl << "1 2" << endl;
    }
    else if (ilosc1==0) {
        cout << 2 << endl << 2 << endl << "1 2" << endl;
    }
    else if (ilosc1==1) {
        cout << 1 << endl << 2 << endl << "1 2" << endl;
    }
return 0;
}