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#include <iostream>

using namespace std;
int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int n; 
	cin >> n;
	bool juzbylo = false;
	int k;
	for (int i = 0; i < n; i++) {
		cin >> k;
		if (k == 1) {
			if(juzbylo){
				i++;
				for (; i < n; i++) {
					cin >> k;
				}
				cout << 0 << "\n" << 2 << "\n" << 1 << " " << 2;;
				return 0;
			}
			else {
				juzbylo = true;
			}
		}
	}

	if (!juzbylo) {
		cout << 2 << "\n";
	}
	else {
		cout << 1 << "\n";
	}


	cout << 2 << "\n" << 1 << " " << 2;
	return 0;
}