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//Jan Sosnowski zadanie pol
#include<iostream>
#include<string>
using namespace std;

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	int n;
	cin >> n;
	int d;
	int ile_jedynek = 0;
	for(int i = 0; i<n;i++){
		cin >> d;
		if(d == 1){
			ile_jedynek ++;
		}
	}
	if(ile_jedynek >= 2){
		cout << 0 << "\n" << 2 << "\n";
		cout << 1 << " " << 2;
	}
	else{
		cout << 2 - ile_jedynek << "\n" << 2 << "\n";
		cout << 1 << " " << 2;
	}
}