using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        Console.WriteLine((int)'b');

        string n1=Console.ReadLine();

        string n2=Console.ReadLine();

        Console.WriteLine(sorted(n1,n2));

    }

    public static string sorted(string str1,string str2)

    {

        string s=" ";

        int a=0,b=0;

        while(a<str1.Length&&b<str2.Length)

        {

            if((int)str1[a]<(int)str2[b])

            {

                s+=str1[a];

                a++;

            }

            else

            {

                s+=str2[b];

                b++;

            }

        }

        while(a<str1.Length)

        {

            s+=str1[a];

            a++;

        }

        while(b<str2.Length)

        {

            s+=str2[b];

            b++;

        }

        return s;

    }

}