using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var input1 = "1110000";

        var input2 = "0001110";

        var combined = input1.Zip

            (

                input2, 

                (a,b) => a == '1' ? a : b

            ); 

        var result = new string(combined.ToArray());

        Console.WriteLine(result);

    }

}