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#include <iostream>
using namespace std;

int main(){
	ios_base::sync_with_stdio(0);
    cin.tie(NULL);
	int n, tmp, amount_of_ones=0;
	cin>>n;
	for(int i=0;i<n;i++){
		cin>>tmp;
		if(tmp == 1) amount_of_ones++;
	}
	if(amount_of_ones >= 2) cout<<"0\n2\n1 2";
	if(amount_of_ones == 1) cout<<"1\n2\n1 2";
	if(amount_of_ones == 0) cout<<"2\n2\n1 2";
}