#include <iostream>
#include <vector>
#include "func_e.h"

using std::cin; using std::cout;
using std::vector; using std::string;
using std::endl;

int main() {
  int a[(int)1e4];
  size_t n; cin >> n;
  for (int i = 0; i < n; ++i)
    cin >> a[i];

  unique(a, &n);

  for (int i = 0; i < n-1; ++i)
    std::cout << a[i] << ' ';
  std::cout << a[n-1] << std::endl;
}