using System;

using System.Collections.Generic;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        var maxGpuLengthsMm = Regex.Replace("380mm (Horizontal) / 360mm (Vertical)", "[^0-9]", " ").Replace(" ", "");

        Console.WriteLine(maxGpuLengthsMm);

        var maxGpuLengthMm = 0;

        foreach (var length in maxGpuLengthsMm)

              if (Convert.ToInt16(length) > maxGpuLengthMm) maxGpuLengthMm = Convert.ToInt16(length);

        Console.WriteLine(maxGpuLengthMm);

​

    }

}