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#include <iostream>

using namespace std;

int main(){



  int n;
  cin >> n;



  int ones = 0;
  for(int i = 0;i < n; i++){

    int cur;

    cin >> cur;

    if (cur == 1){
      ones ++;
    }
  }

  cout << (2 - min(2, ones)) << endl;
  cout << 2 << endl;
  cout << "1 2" << endl;
}