1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
#include <bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin >> n;
    int lisci = 0;
    for (int i = 0; i < n; i++){
        int x; 
        cin >> x;
        if (x == 1){ lisci++;}
    }
    cout << max(0, 2-lisci) << "\n2\n";
    cout << "1 2\n";
}