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);