//In the name of God
#include <iostream>
using namespace std;

const int MAXN=1e5+1e3+1e2;

bool hasch[MAXN];
int par[MAXN],lcnt[MAXN];

int main()
{
  ios_base::sync_with_stdio(false);
  int n;
  cin>>n;
  for(int i=1;i<=n;++i)
    {
      int p;
      cin>>p;
      par[i]=p;
      hasch[p]=true;
    }
  for(int i=1;i<=n;++i)
    if(hasch[i]==false)
      lcnt[par[i]]++;
  int maxi=0,maxcnt=0;
  for(int i=1;i<=n;++i)
    if(lcnt[i]==maxi)
      maxcnt++;
    else if(lcnt[i]>maxi)
      {
	maxi=lcnt[i];
	maxcnt=1;
      }
  cout<<maxi<<" "<<maxcnt<<endl;
  for(int i=1;i<=n;++i)
    if(lcnt[i]==maxi)
      cout<<i<<" ";
  cout<<endl;
  return 0;
}