package chelper;

import io.InputReader;
import io.OutputWriter;
import solutions.ChelperSolution;


public class C extends ChelperSolution {

  @Override
  public void solve(int testNumber, InputReader in, OutputWriter out) {
    super.solve(testNumber, in, out);
  }

  @Override
  public void solve(int testNumber) {
    int n = in.nextInt();

    int prev = 0;
    boolean first = true;

    for (int i = 0; i < n; i++) {
      if (i % 100000 == 0) {
        System.gc();
      }

      int cur = in.nextInt();

      if (!first && cur == prev) {
        continue;
      }

      out.println(cur);

      first = false;
      prev = cur;
    }
  }
}