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#include <bits/stdc++.h>

using namespace std;
typedef vector<int> VI;
typedef long long LL;
typedef pair<int,int> PI; 
typedef pair<LL,LL> PLL;
typedef unsigned long long ULL;
typedef pair<double,double> PD;

#define FOR(x, b, e) for(int x = b; x<= (e); x++)
#define FORD(x, b, e) for(int x = b; x>= (e); x--)
#define REP(x, n) for(int x = 0; x<(n); ++x)
#define ALL(c) (c).begin(), (c).end()
#define SIZE(x) ((int)(x).size())

#define PB push_back
#define IN insert
#define ST first
#define ND second
#define INF 2000000011
#define MOD 1000000007

#define MAXSIZE 

int n;

int main(){//serio?
	ios::sync_with_stdio(0); cin.tie(0);
	
	cin>>n;
	int sum=0;
	REP(i,n){
		int t1;
		cin>>t1;
		if(t1==1)
			sum++;
	}
	
	cout<<max(2-sum,0)<<"\n";
	cout<<"2\n";
	cout<<"1 2\n";
	
	return 0;
}