using System;
public class Program
{
public static string AddBinaryStrings(string a, string b) {
int num1 = Convert.ToInt32(a, 2);
int num2 = Convert.ToInt32(b, 2);
int sum = num1 + num2;
return Convert.ToString(sum, 2);
}
public static void Main(string[] args)
{
string a = "11";
string b = "1";
Console.WriteLine(AddBinaryStrings(a, b));
a = "1010";
b = "1011";
Console.WriteLine(AddBinaryStrings(a, b));
}
}
/*
run:
100
10101
*/