MoreRegex/2.Email me

using System;
using System.Text.RegularExpressions;
using System.Linq;
using System.Globalization;
using System.Collections.Generic;
using System.Text;

class MainClass

{

    public static void Main(string[] args)

    {
        string input = Console.ReadLine();

        Match before = Regex.Match(input, @".*@");
        Match after = Regex.Match(input, @"@.*");

        int b = 0;
        int a = 0;
        foreach(var s in before.ToString())
        {
            b += Convert.ToInt32(s);
        }
        foreach(var s in after.ToString())
        {
            a += Convert.ToInt32(s);
        }

        if ((b - a) >= 0)
        {

            Console.WriteLine("Call her!");

        }
        else
        {
            Console.WriteLine("She is not the one.");
        }
    }
}