#include<bits/stdc++.h>
using namespace std;
int main() {
  int N;
  cin >> N;
  vector<int> A(N);
  for (int i = 0; i < N; i++) {
    cin >> A[i];    
  } 
  map<int, int> mR;
  for (int i = 0; i < N; i++) {
    mR[A[i]]++;
  }
  int cnt = 0;
  for (auto w : mR) {
    cnt += w.second - 1;
  }
  map<int, int> mL;
  int ans = 0;
  vector<int> B;
  for (int i = 0; i < N - 1; i++) {
    if (mL.count(A[i])) break;
    mL[A[i]]++;
    mR[A[i]]--;
    if (mR[A[i]]) cnt--;
    if (cnt == 0) {
      B.push_back(i + 1);
      ans++;
    }
  }
  cout << ans << endl;
  for (int i = 0; i < ans; i++) {
    cout << B[i] << ' ';
  }
  cout << endl;
}