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#include <iostream>
using namespace std;

int main() {
	int n;
	cin >> n;
	int num_1 = 0;
	for(int i = 0; i < n; ++i) {
		int x;
		cin >> x;
		if(x == 1 && num_1 < 2) ++num_1;
		if(num_1 == 2)	break;
	}
	cout << 2-num_1 << endl;
	cout << "2\n1 2" << endl;
	return 0;
}