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#include<bits/stdc++.h>
#define ll long long
#define ld long double
using namespace std;
const int N = 1000000;
int n,a[N+10],ile;
int main()
{
	ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	cin>>n;
	for(int i=1; i<=n; ++i){
		cin>>a[i];
		if(a[i]==1)ile++;
	}
	if(ile>=2)cout<<"0\n2\n1 2";
	else if(ile==1)cout<<"1\n2\n1 2";
	else cout<<"2\n2\n1 2";
}