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#include <bits/stdc++.h>
using namespace std;

void solve() {
	int n, iOne = 0;
	cin >> n;
	for (int i = 0, x; i < n; i++) {
		cin >> x;
		if(x == 1) {
			iOne++;
		}
	}
	iOne = min(iOne, 2);
	cout << 2 - iOne << "\n";
	cout << "2\n1 2\n";
}

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(NULL);
	cout.tie(NULL);

	solve();

	return 0;
}