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#include <bits/stdc++.h>
using namespace std;
int n,akt,akt1,akt2;
int t[1000005];
int main()
{
	cin>>n;
	for(int i=1;i<=n;i++)
	{
		cin>>t[i];
		if(t[i]==1)akt++;
	}
	if(akt>=2)
	{
		cout<<0<<endl;
		cout<<2<<endl;
		cout<<1<<" "<<2<<endl;
	}
	else if(akt==1)
	{
		cout<<1<<endl;
		cout<<2<<endl;
		cout<<1<<" "<<2<<endl;
	}
	else if(!akt)
	{
		cout<<2<<endl;
		cout<<2<<endl;
		cout<<1<<" "<<2<<endl;
	}
}