using System;

public class Test
{
	public static void Main()
	{
		var s = "PH/2400310945 01.09.21 WARRANTY2021091D 19307.92- 0 -19,307.92";
        var result = System.Text.RegularExpressions.Regex.Match(s, @" -?\d+(?:,\d{3})*(?:\.\d{2})?$").Value;
        Console.WriteLine(result);
	}
}