#include <bits/stdc++.h>
using namespace std;

using ll = long long;
#define rep(i, n) for (ll i = 0; i < n; i++)
#define rep2(i, l, r) for (ll i = l; i < r; i++)

using vi = vector<int>;
using vvi = vector<vi>;
using vll = vector<ll>;

/* ---- */
#define all(A) A.begin(), A.end()
#define elif else if
using pii = pair<ll, ll>;

bool chmin(auto &a, const auto &b) { return a > b ? a = b, 1 : 0; }
bool chmax(auto &a, const auto &b) { return a < b ? a = b, 1 : 0; }

struct IOSetup {
  IOSetup() {
    cin.tie(0);
    ios::sync_with_stdio(0);
  }
} iosetup;

template <class T>
void print(vector<T> a) {
  for (auto x : a) cerr << x << ' ';
  cerr << endl;
}

void print(auto x) { cerr << x << endl; }

template <class Head, class... Tail>
void print(Head &&head, Tail &&...tail) {
  cerr << head << ' ';
  print(forward<Tail>(tail)...);
}

int main(){
  int n;
  cin>>n;
  vi deg(n,0);
  rep(i,n-1){
    int p;
    cin>>p;
    p--;
    deg[p]++;
  }
  int l=0;
  rep(i,n)if(deg[i]==0)l++;
  int rem=0;
  rep(i,n){
    if(deg[i]>=2)rem++;
  }
  int ans=1;
  rep(i,l){
    cout<<ans<<" \n"[i+1==l];
    if(rem>0){
      rem--;
      ans++;
    }
    ans++;
  }
}