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#include <bits/stdc++.h>
using namespace std;
#define e1 first
#define e2 second
#define pb push_back
#define mp make_pair
#define boost ios_base::sync_with_stdio(false)
#define eb emplace_back
#define OUT(x) {cout << x; exit(0); }
#define FOR(i, a, b) for (int i=(a); i<=(b); ++i)
typedef long long ll;
typedef unsigned long long ull;
typedef pair <int, int> PII;
typedef pair <ll, ll> PLL;
typedef pair <PLL, PLL> PP;
typedef unsigned int ui;
const int mod = 1e9+7;
const int inf = 1e9+9;
const ll MOD = 1e9+696969;
const ll INF = 1e18;
int a, n, wyn = 0;

int main()
{
	boost;
	cin >> n;
	FOR(i, 1, n) {
		cin >> a;
		if (a == 1) ++wyn;
	}
	
	cout << max(0, 2 - wyn) << endl;
	cout << "2\n1 2\n" << endl;
}