using System;
using System.Text.RegularExpressions;
using System.Linq;
public class Test
{
    public static void Main()
	{
        string[] strings =
        {
            "ABC1100 - 2ppl",
            "ABC1300",
            "ABC 1300",
            "ABC-1300",
            "Managers Associates Only (ABC1100 - 2ppl)"
        };
 
        var reg = new Regex(@"ABC[\s,-]?[0-9]+");
 
        var systemNames = strings.Select(line => reg.Match(line).Value);
 
        systemNames.ToList().ForEach(Console.WriteLine);
	}
}

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