#include <bits/stdc++.h>
using namespace std;
using ll  = long long;
using Vi  = vector<int>;
using Pii = pair<int,int>;
#define x first
#define y second
#define pb push_back
#define mp make_pair
#define rep(i,b,e) for(int i=(b); i<(e); i++)
#define each(a,x)  for(auto& a : (x))
#define all(x)     (x).begin(),(x).end()
#define sz(x)      int((x).size())
#define endl "\n"
const long long inf = 2e17 + 10;


bool is_vowel( char c ){
	string vowels = "aeiouy";
	size_t pos = vowels.find_first_of(c,0);
	return pos != string::npos; 
}

void solve(){
	int n;
	cin >> n;
	int count = 0;
	for( int i = 0; i < n; i++ ){
		int a;
		cin >> a;
		if( a == 1 ){
			count++;
		}
	}
	count = min(count,2);
	cout << 2 - count << endl;
	cout << "2" << endl;
	cout << "1 2" << endl;


}

void clear(){
}

int main() {
	cin.sync_with_stdio(0); cin.tie(0);
	cout << fixed << setprecision(10);
	int z = 1;
	//cin >> z;
	for(int i = 0; i < z; i++){
		solve();
		clear();
	}
}