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#include <iostream>
#include <vector>
#include <queue>
#include <algorithm>
#include <set>
#include <map>
#include <bits/stdc++.h>


using namespace std;

int main()
{
  ios::sync_with_stdio(0);
  int n; cin >> n;
  int ct1 = 0;
  for(int i=0; i<n; i++)
  {
    int a; cin >> a; if(a==1) ++ct1;
  }

  int result;
  if(ct1 >= 2)
    result = 0;
  if(ct1 == 1)
    result = 1;
  if(ct1 == 0)
    result = 2;
  
  cout << result << endl;
  cout << 2 << endl;
  cout << 1 << " " << 2 << endl;

}