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


public class CombineListsOfLetters {

    public static void main(String[] args){

        Scanner input = new Scanner(System.in);

        String input_one = input.nextLine();

        String input_two = input.nextLine();

        char[] chars_one = input_one.toCharArray();

        char[] chars_two = input_two.toCharArray();

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

        ArrayList<Character> check = new ArrayList<Character>();

        for (Character character : chars_one) {
            result.add(character);
            check.add(character);
        }


            for (int j = 0; j < chars_two.length; j++) {
                if (!check.contains(chars_two[j])) {
                    result.add(' ');
                    result.add(chars_two[j]);
                }
            }

        for (Character character : result) {
            System.out.print(character);
        }
        input.close();
    }
}