using System;

public class Program

{

    public static void Main()

    {

        string indata = "001 011";

        string[] inputs = indata.Split(' ');

        string n1 = inputs[0];

        string n2 = inputs[1];

​

      // Console.WriteLine(n1[2].ToString()); // takes out from char.

        string Result = "";

        for(int i = 0; i<n1.Length;i++)

        {

            if(n1[i] == 1 && n2[i]==1)

                Result = Result + n1[i] ;

            else if(n1[i] > n2[i])

                Result = Result + n1[i];

            else

                Result = Result + n2[i];

        }

​

        Console.WriteLine(Result);

    }

}