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#include <cstdio>
#include <iostream>
#include <cstdlib>

using namespace std;

int main()
{
	int n;
	int ile_jeden=0;
	int liczba;
	cin>>n;
	
	
	for(int i=0;i<n;i++)
	{
		cin>>liczba;
		if(liczba==1)
		{
			ile_jeden++;
		}
	}
	if(ile_jeden>1)
	{
		cout<<0<<endl;
		cout<<2<<endl;
		cout<<1<<" "<<2<<endl;
	}
	if(ile_jeden==1)
	{
		cout<<1<<endl;
		cout<<2<<endl;
		cout<<1<<" "<<2<<endl;
	}
	if(ile_jeden==0)
	{
		cout<<2<<endl;
		cout<<2<<endl;
		cout<<1<<" "<<2<<endl;
	}
	
	
	return 0;
}