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#include <cstdio>
// Marcin Regdos | Potyczki Algorytmiczne 2018 | Runda 1A POD Podrzewo
using namespace std;
int main(){
  int leafs = 0, result = 0, n = 0 ;
  scanf ("%d", &n);
  for (int i = 0; i< n && leafs < 2;++i)
  {
    int a;
    scanf("%d", &a);
    if (a == 1) ++leafs;   
  }
  
  
  result = 2 - leafs;
  printf ("%d\n2\n", result);
  printf ("1 2\n");  
  return 0;
}