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#include <iostream>
#include <string>

using namespace std;
int c;
int n;

int main() {
  ios::sync_with_stdio(false);

  int b = 0;

  cin >> c;

  for(int i = 0; i < c; i++) {
    cin >> n;
    if(n == 1) {
      b++;
    }
  }

  if(b == 0) {
    cout << "2" << endl;
  } else if(b == 1) {
    cout << "1" << endl;
  } else {
    cout << "0" << endl;
  }

  cout << "2" << endl;
  cout << "1 2" << endl;
  return 0;
}