using System;

public class Program

{

    public static void Main()

    {

        string[] loadNumbers = new string[]{"12345678-O425","12345CH812","7617-982984729CH","92734"};

        foreach(string loadNumber in loadNumbers)

        {

            string truncatedNumber = loadNumber.Substring(0,loadNumber.IndexOf('-'));

            Console.WriteLine(loadNumber + " -> " + truncatedNumber);   

        }

    }

}