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#include <cstdio>
#include <iostream>
#include <algorithm>

using namespace std;

int main(){
	int n;
	cin >> n;
	int ile=0;
	int x;
	while(n--){
		cin >> x;
		if(x==1){
			ile++;
		}
		if(ile >= 2){
			break;
		}
	}
	if(ile >= 2){
		cout << "0\n";
	}else{
		if(ile == 1){
			cout << "1\n";
		}else{
			cout << "2\n";
		}
	}
	cout << "2\n";
	cout << "1 2\n";
	return 0;
}