My C# code: Same Logic Different Implementation.

    static void Main(string[] args)
    {
        string a = Console.ReadLine();
        string b = Console.ReadLine();

        int LenA = a.Length;
        int LenB = b.Length; 

        List<char> ListA = new List<char>(LenA);
        List<char> ListB = new List<char>(LenB);

        ListA = a.ToList();
        ListB = b.ToList();

        int total = LenA + LenB;

        int count = 0;

        for (int i = 0; i < LenA; i++)
        {
            if (ListB.Contains(ListA[i]))
            {
                count++;
                ListB.Remove(ListA[i]);
            }
        }

        Console.WriteLine(total - (2*count));
     }

Let me know if i can improve it. Thanks.