using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("enter the string 1");

        string s1=Console.ReadLine();

        Console.WriteLine("enter the string 2");

        string s2=Console.ReadLine();

        string e="";

        if(s1.Length==s2.Length){

            e=e+s1+s2;

            Console.WriteLine(e);

        }else if(s1.Length>s2.Length){

            int z=s1.Length-s2.Length;

            e=e+s1.Substring(z)+s2;

            Console.WriteLine(e);

        }else{

        int z=s2.Length-s1.Length;

            e=e+s2+s2.Substring(z); 

            Console.WriteLine(e);

        }

    }

}