#include <iostream>
#include <string>
#include <vector>

using namespace std;

int main()
{
  int k, h = 0;
  unsigned int i;
  cin >> k;
  vector<int> a;
  for (i = 0; i < k; i++){
  cin >> h;
  a.push_back(h);
  }
  for (i = 0; i < a.size(); i++){
     for (h = i+1; h < a.size; h++){
      if(a.at(i) == a.at(h)){
       a.erase(a.begin + h);
      }
     }
  }
  for (i = 0; i < a.size(); i++){
  cout << a.at(i);
  }
return 0;
}