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#include <cstdio>

int main()
{
  int n;
  scanf("%d\n", &n);
 
  int ile = 0;
  for (int i = 0; i < n; i++)
  {
    int d;
    scanf("%d", &d);
    
    if (d == 1)
    {
      ile++;
      if (ile == 2)
      {
        printf("0\n");
        printf("2\n");
        printf("1 2\n");
        return 0;
      }
    }
  }
  
  if (ile == 1)
  {
    printf("1\n");
    printf("2\n");
    printf("1 2\n");
    return 0;
  }
  
  printf("2\n");
  printf("2\n");
  printf("1 2\n");
  
  
  return 0;
}