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#include <bits/stdc++.h>
int main(){
	std::ios_base::sync_with_stdio(0);
	std::cin.tie(NULL);
	int ilosc = 0, n, x;
	std::cin >> n;
	for(int i = 0; i < n; i++){
		std::cin >> x;
		if(x == 1) ilosc++;
	}
	std::cout << (2 - std::min(2, ilosc)) << "\n" << "2" << "\n" << "1 2" << "\n";
}