import java.util.ArrayList;
import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    // "watermelon", "beachball", "shrinebell"
    ArrayList<String> choices = new ArrayList<>();
    choices.add("watermelon");
    choices.add("beachball");
    choices.add("shrinebell");
    Scanner sc = new Scanner(System.in);
    choices.remove(sc.next());
    choices.remove(sc.next());
    System.out.println(choices.get(0));
  }
}