1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
#include <iostream>

using namespace std;

inline void solve() {
	int size;
	int vert;
	int ones = 0;

	cin >> size;
	for(int i = 0; i < size; ++i){
		cin >> vert;
		if(vert == 1){
			++ones;
		}
	}

	cout << (ones >= 2 ? 0 : 2 - ones) << endl << 2 << endl << 1 << " " << 2 << endl;
}

int main(int argc, char **argv) {
	ios_base::sync_with_stdio(0);

	solve();

	return 0;
}