using System;
public class Test
{
public static void Main()
{
string[] ip = Console.ReadLine().Split('.');
string[] mask = Console.ReadLine().Split('.');
for (int i=0; i < 4; i++)
{
if (i>0) Console.Write('.');
Console.Write(int.Parse(ip[i]) & int.Parse(mask[i]));
}
}
}
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