using System;

public class Program

{

    public static void Main()

    {

        var input = "434179-xxx-xxx-0044";

        char delimiter = '-';

        var delimiterIndex = input.IndexOf(delimiter);

        Console.WriteLine(delimiterIndex);

        if(delimiterIndex > 0)

        {

            var ss = input.Substring(0, delimiterIndex);

​

            Console.WriteLine(ss);  

            return;

        }

        Console.WriteLine(input);

    }

}