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#include <iostream>
#include <algorithm>
#include <vector>
#include <cmath>
using namespace std;

typedef long long ll;
typedef unsigned int ui;
typedef pair<int, int> pii;
typedef vector<int> vi;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);

	int ones = 0;
	int n, deg;
	cin >> n;

	for (int i = 0; i < n; ++i) {
		cin >> deg;
		if (deg == 1)
			++ones;
		if (ones >= 2)
			break;
	}

	cout << 2 - ones << endl;
	cout << 2 << endl;
	cout << "1 2" << endl;

    return 0;
}