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#include<iostream>
#include<algorithm>
#include<stdint.h>
#include<string>

using namespace std;

void answer(int count) {
	switch (count) {
	case 1:
		cout << 1 << endl;
		cout << 2 << endl;
		cout << 1 << " "<< 2 << endl;
		break;
	case 0:
		cout << 2 << endl;
		cout << 2 << endl;
		cout << 1 << " " << 2 << endl;
		break;
	default:
		cout << 0 << endl;
		cout << 2 << endl;
		cout << 1 << " " << 2 << endl;
		break;
	}
}

int main() {
	ios_base::sync_with_stdio(false);
	int n;
	cin >> n;
	int count = 0;
	int x;
	for (int i = 0; i < n; i++) {
		cin >> x;
		if (x == 1) {
			count++;
		}

	}
	answer(count);
	return 0;
}