#include <iostream>
#include <vector>
using namespace std;

int main()
{
    int n;
    cin>>n;
    int munkak=0;
    vector <int> ki;
    int hi;
    for(int i=0;i<n;i++){
        cin>>hi;
        if(hi>munkak){
            munkak++;
            ki.push_back (i+1);
        }
    }
    cout<<munkak<<endl;
    for(int i=0;i<ki.size();i++){
        cout<<ki [i]<<" ";
    }
    return 0;
}