package com.scalefocus;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;
import java.util.stream.Collectors;

public class Main {

    public static void main(String[] args) {
	    Scanner sc = new Scanner(System.in);
        List<Integer> list1 = Arrays
                .stream(sc.nextLine().split(" "))
                .map(Integer::parseInt)
                .collect(Collectors.toList());

        List<Integer> list2 = Arrays
                .stream(sc.nextLine().split(" "))
                .map(Integer::parseInt)
                .collect(Collectors.toList());

        List<Integer> result = new ArrayList<Integer>();

        for (int i = 0; i < Math.min(list1.size(), list2.size()); i++) {
            result.add(list1.get(i));
            result.add(list2.get(i));
        }

        List<Integer> remainingItems = getRemainingItems(list1, list2);


        //System.out.println(remainingItems.toString());
        result.addAll(remainingItems);
        System.out.println(result.toString());

    }

    private static List<Integer> getRemainingItems(List<Integer> list1,
                                                   List<Integer> list2) {
        List<Integer> longerList =
                (list1.size() >= list2.size()) ? list1 : list2;

        int shorterListSize =
                (list1.size() <= list2.size())
                        ? list1.size() : list2.size();
        List<Integer> remainingItems = new ArrayList<Integer>();
        for(int index = shorterListSize; index < longerList.size(); index++){
            remainingItems.add(longerList.get(index));
        }

        return remainingItems;
    }
}