package CollectionsHomework;

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


public class Problem7CombineListsOfLetters {
    public static void main(String[] args) {
        Scanner console = new Scanner(System.in);

        ArrayList<String> listOne = new ArrayList<>(Arrays.asList(console.nextLine().split(" ")));
        ArrayList<String> listTwo = new ArrayList<>(Arrays.asList(console.nextLine().split(" ")));
        ArrayList<String> combinedList = new ArrayList<>();

        for (int i = 0; i < listOne.size(); i++) {
            combinedList.add(listOne.get(i));

        }


        for (int i = 0; i < listTwo.size(); i++) {
            if (listOne.contains(listTwo.get(i))) {
                continue;

            } else {
                combinedList.add(listTwo.get(i));
            }

        }
        for (String symbol : combinedList) {
            System.out.print(symbol + " ");
        }

    }
}