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

public class _09_CombineListsOfLetters {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        ArrayList<Character> firstLine = new ArrayList<>();
        ArrayList<Character> secondLine = new ArrayList<>();
        ArrayList<Character> result = new ArrayList<>();


        for(char ch : sc.nextLine().toCharArray()){
            firstLine.add(ch);
        }
        for(char ch : sc.nextLine().toCharArray()){
            secondLine.add(ch);
        }

        result.addAll(firstLine);

        for (int i = 0; i < secondLine.size(); i++) {

            if(firstLine.contains(secondLine.get(i))){
                continue;
            }
            else {
                result.add(' ');
                result.add(secondLine.get(i));
            }
        }

        for (int i = 0; i < result.size(); i++) {
            System.out.print(result.get(i));
        }
    }

}