import java.util.List;
import java.util.LinkedList;

public class Pop {
  private static int popNum = 0;
  private int thisPop;
  public Pop() {
    thisPop = popNum++;
  }
  public String toString() {
    return "Pop " + thisPop;
  }
  public static void main(String args[]) {
    List<Pop> pops = new LinkedList<Pop>();
    for (int i = 0; i < 10; i++) {
      pops.add(new Pop());
    }
    for (Pop p : pops) {
      System.out.println(p);
    }
  }
}